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Parasomnia

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This article is about the disorder. For the 2008 film, see Parasomnia (film). For the Dream Theater album, see Parasomnia (album).
Parasomnia
SpecialtySleep medicine, psychology Edit this on Wikidata

Parasomnias are a category of sleep disorders that involve abnormal movements, behaviors, emotions, perceptions, and dreams that occur while falling asleep, sleeping, between sleep stages, or during arousal from sleep. Parasomnias are dissociated sleep states which are partial arousals during the transitions between wakefulness, NREM sleep, and REM sleep, and their combinations.

Classification

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The newest version of the International Classification of Sleep Disorders (ICSD, 3rd. Ed.) uses State Dissociation as the paradigm for parasomnias.[1][2] Unlike before, where wakefulness, non-rapid eye movement (NREM) sleep, and rapid eye movement (REM) sleep were considered exclusive states, research has shown that combinations of these states are possible and thus, may result in unusual unstable states that could eventually manifest as parasomnias or as altered levels of awareness.[1][3][4][5][6][7]

Although the previous definition is technically correct, it contains flaws. The consideration of the State Dissociation paradigm facilitates the understanding of the sleep disorder and provides a classification of 10 core categories.[1][2]

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NREM parasomnias are arousal disorders that occur during stage 3 (or 4 by the R&K standardization) of NREM sleep—also known as slow wave sleep (SWS). They are caused by a physiological activation in which the patient's brain exits from SWS and is caught in between a sleeping and waking state. In particular, these disorders involve activation of the autonomic nervous system, motor system, or cognitive processes during sleep or sleep-wake transitions.[8]

Diagnosis

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Differential diagnosis for NREM-related parasomnias:[2]

  • Sleep-disordered breathing
  • REM-related parasomnias
  • Nocturnal seizures
  • Psychogenic dissociative disorders

Confusional arousals

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Main article: Confusional arousals

Confusional arousal is a condition when an individual awakens from sleep and remains in a confused state. It is characterized by the individual's partial awakening and sitting up to look around. They usually remain in bed and then return to sleep. These episodes last anywhere from seconds to minutes and may not be reactive to stimuli.[9] Confusional arousal is more common in children than in adults. It has a lifetime prevalence of 18.5% in children and a lifetime prevalence of 2.9–4.2% in adults.[10][11][12][13] Infants and toddlers usually experience confusional arousals beginning with large amounts of movement and moaning, which can later progress to occasional thrashings or inconsolable crying. In rare cases, confusional arousals can cause injuries and drowsy driving accidents, thus it can also be considered dangerous.[14] Another sleeping disorder may be present triggering these incomplete arousals.[15]

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Main article: Sleep sex

Sleep-related abnormal sexual behavior, Sleep sex, or sexsomnia, is a form of confusional arousal that may overlap with somnambulism.[1] Thereby, a person will engage in sexual acts while still asleep. It can include such acts as masturbation, inappropriate fondling themselves or others, having sex with another person; and in more extreme cases, sexual assault.[16] These behaviors are unconscious, occur frequently without dreaming, and bring along clinical, social, and legal implications.[17] It has a lifetime prevalence of 7.1% and an annual prevalence of 2.7%.[11]

Sleepwalking (somnambulism)

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Main article: Sleepwalking

Sleepwalking has a prevalence of 1–17% in childhood, with the most frequent occurrences around the age of eleven to twelve. About 4% of adults experience somnambulism.[18]

Normal sleep cycles include states varying from drowsiness all the way to deep sleep. Every time an individual sleeps, he or she goes through various sequences of non-REM and REM sleep. Anxiety and fatigue are often connected with sleepwalking. For adults, alcohol, sedatives, medications, medical conditions and mental disorders are all associated with sleepwalking. Sleep walking may involve sitting up and looking awake when the individual is actually asleep, and getting up and walking around, moving items or undressing themselves. They will also be confused when waking up or opening their eyes during sleep. Sleep walking can be associated with sleeptalking.[19]

Sleep terrors (night terrors/pavor nocturnus)

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Main article: Night terror

Sleep terror is the most disruptive arousal disorder since it may involve loud screams and panic; in extreme cases, it may result in bodily harm or property damage by running about or hitting walls. All attempts to console the individual are futile and may prolong or intensify their confused state. Usually they experience amnesia after the event but it may not be complete amnesia. Up to 3% of adults have sleep terrors and exhibited behavior of this parasomnia can range from mild to extremely violent. This is very prevalent in those who have violent post-traumatic stress disorder (PTSD).[10] They typically occur in stage 3 sleep.[20]

[edit]
Main article: Nocturnal sleep-related eating disorder

The Diagnostic and Statistical Manual of Mental Disorders (DSM-V) classifies sleep-related eating disorder (SRED) under sleepwalking, while ICSD classifies it as NREM-related parasomnia.[1][21] It is conceptualized as a mixture of binge-eating behavior and arousal disorder.[1][21] Thereby, preferentially high-caloric food is consumed in an uncontrolled manner.[22] However, SRED should not be confused with nocturnal eating syndrome, which is characterized by an excessive consumption of food before or during sleep in full consciousness.[22][23] Since sleep-related eating disorders are associated with other sleep disorders, successful treatment of the latter can reduce symptoms of this parasomnia.[22]

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REM sleep behavior disorder

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Unlike other parasomnias, rapid eye movement sleep behavior disorder (RBD) in which muscle atonia is absent is most common in older adults.[24] This allows the individual to act out their dreams and may result in repeated injury—bruises, lacerations, and fractures—to themselves or others. Patients may take self-protection measures by tethering themselves to bed, using pillow barricades, or sleeping in an empty room on a mattress.[10] Besides ensuring the sleep environment is a safe place, pharmacologic therapy using melatonin and clonazepam is also common as a treatment for RBD, even though they might not eliminate all abnormal behaviours.[25] Before starting a treatment with clonazepam, a screening for obstructive sleep apnea should performed.[22] However, clonazepam needs to be manipulated carefully because of its significant side effects, i.e., morning confusion or memory impairment,[22] mainly in patients with neurodegenerative disorders such as dementia.[26]

Demographically, 90% of RBD patients are males, and most are older than 50 years of age.[10] However, this prevalence in males could be biased due to the fact that women tend to have a less violent type of RBD, which leads to lower reports at sleep centres and different clinical characteristics.[27][28] While men might have more aggressive behaviour during dreaming, women have presented more disturbance in their sleep.[27][28] RBD may be also influenced by a genetic compound, since primary relatives seem to have significantly more chance to develop RBD compared with non-relatives control group.[25][29]

Typical clinical features of REM sleep behavior disorder are:[30]

  • Male gender predilection
  • Mean age of onset 50–65 years (range 20–80 years)
  • Vocalisation, screaming, swearing that may be associated with dreams
  • Motor activity, simple or complex, that may result in injury to patient or bed-partner
  • Occurrence usually in latter half of sleep period (REM sleep)
  • May be associated with neurodegenerative disease

Acute RBD occurs mostly as a result of a side-effect in prescribed medication—usually antidepressants. Furthermore, substance abuse or withdrawal can result in RBD.[22]

Chronic RBD is idiopathic, meaning of unknown origin, or associated with neurological disorders.[22] There is a growing association of chronic RBD with neurodegenerative disorders—Parkinson's disease, multiple system atrophy (MSA), or dementia—as an early indicator of these conditions by as much as 10 years. RBD associated with neurological disorders is frequently related to abnormal accumulation of alpha-synuclein, and more than 80% of patients with idiopathic RBD might develop Lewy body disease (LBD).[25]

The diagnosis is based on clinical history, including partner's account and needs to be confirmed by polysomnography (PSG), mainly for its accuracy in differentiating RBD from other sleep disorders, since there is a loss of REM atonia with excessive muscle tone.[22] However, screening questionnaires, such as RBDSQ, are also very useful for diagnosing RBD.[25][27][28]

Hypnogely

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A similar phenomenon to somniloquy named hypnogely has been observed, characterised by the sleeper spontaneously laughing. This phenomenon appears to be fairly common.[31] In a majority of cases, hypnogely is a genuine behavioural response and benign physiological phenomenon that occurs while the sleeper is dreaming in REM sleep. The laughter exhibited by subjects experiencing hypnogely isn't always connected with the subject of the dream; 'Typically, these dreams are odd, bizarre or even unfunny for a person when awake'.[32] In a minority of cases, hypnogely may be associated with neurological disorders of the central nervous system.[32]

Recurrent isolated sleep paralysis

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Recurrent isolated sleep paralysis is an inability to perform voluntary movements at sleep onset, or upon waking from sleep.[22] Although the affected individual is conscious and recall is present, the person is not able to speak or move. However, respiration remains unimpaired.[22] The episodes last seconds to minutes and diminish spontaneously.[22] The lifetime prevalence is 7%.[33] Sleep paralysis is associated with sleep-related hallucinations.[22] Predisposing factors for the development of recurrent isolated sleep paralysis are sleep deprivation, an irregular sleep-wake cycle, e.g. caused by shift work, or stress.[22] A possible cause could be the prolongation of REM sleep muscle atonia upon awakening.[34]

Nightmare disorder

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Nightmares are like dreams primarily associated with REM sleep. Nightmare disorder is defined as recurrent nightmares associated with awakening dysphoria that impairs sleep or daytime functioning.[1][2] It is rare in children, however persists until adulthood.[11][35] About 2/3 of the adult population report experiencing nightmares at least once in their life.[11]

Catathrenia

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Main article: Catathrenia

Before the ICSD-3, catathrenia was classified as a rapid-eye-movement sleep parasomnia, but is now classified as sleep-related breathing disorder.[1][36]

[edit]

The painful penile erections will appear only during sleep.[37] This condition is present during REM sleep.[37] Sexual activity does not produce any pain.[37] There is no lesion or physical damage, but hypertonia of the pelvic floor could be one cause.[38] It affects men of all ages, but especially from middle-age onward.[38] Several pharmacologic treatments such as propranolol, clozapine, clonazepam, baclofen and various antidepressants are considered effective.[37]

Other parasomnias

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Exploding head syndrome

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Main article: Exploding head syndrome
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Sleep-related hallucinations are brief episodes of dream-like imagery that can be of any sensory modality, i.e., auditory, visual, or tactile.[2] They are differentiated between hypnagogic hallucination, that occur at sleep onset, and hypnapompic hallucinations, which occur at the transition of sleep to awakening.[2] Although normal individuals have reported nocturnal hallucinations, they are more frequent in comorbidity with other sleep disorders, e.g. narcolepsy.[1][2][39]

Sleep enuresis

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Main article: Nocturnal enuresis

Parasomnia, unspecific

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  • Sleep drunkenness, also known as confusional arousal, is the feeling of confusion or sudden action upon waking up from deep sleep. Severe sleep inertia, one cause of oversleeping, is considered to develop sleep drunkenness.[40]

Isolated symptom/normal variant

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Sleep talking (somniloquy)

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According to ICSD-3 it is not defined a disorder in particular. It is rather an isolated symptom or normal variant and ranges from isolated speech to full conversations without recall.[1][2][22] With a lifetime prevalence of 69% it is considered fairly common.[11] Sleep talking is associated with REM-related parasomnias as well as with disorders or arousal.[1][2] It occurs in all sleep states. As yet, there is no specific treatment for sleeptalking available.[22]

Diagnosis

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Parasomnias are most commonly diagnosed by means of questionnaires. These questionnaires include a detailed analyses of the clinical history and contain questions to:[22]

  1. Rule out sleep deprivation
  2. Rule out effects of intoxication or withdrawal
  3. Rule out sleep disorders causing sleep instability
  4. Rule out medical disorders or treatments associated with sleep instability
  5. Confirm presence of NREM parasomnias in other family members and during the patient's childhood
  6. Determine the timing of the events
  7. Determine the morphology of the events.

Furthermore, a sleep diary is helpful to exclude that sleep deprivation could be a precipitating factor.[22] An additional tool could be the partner's log of the events.[22] The following questions should therefore be considered:[41]

  1. Do you or your bed partner believe that you move your arms, legs, or body too much, or have unusual behaviors during sleep?
  2. Do you move while dreaming, as if you are simultaneously attempting to carry out the dream? Have you ever hurt yourself or your bed partner during sleep?
  3. Do you sleepwalk or have sleep terrors with loud screaming?
  4. Do your legs feel restless or begin to twitch a lot or jump around when you are drowsy or sleepy, either at bedtime or during the day?
  5. Do you eat food or drink fluids without full awareness during the night? Do you wake up in the morning feeling bloated and with no desire to eat breakfast?

In potentially harmful or disturbing cases a specialist in sleep disorders should be approached.[22] Video polysomnographic documentation is necessary only in REM sleep behavior disorder (RBD), since it is an essential diagnostic criteria in the ICSD to demonstrate the absence of muscle atonia and to exclude comorbid sleep disorders.[1][2][22] For most of the other parasomnias, polysomnographic monitoring is a costly, but still supportive tool in the clinical diagnosis.[2][22]

The use of actigraphy can be promising in the diagnostical assessment of NREM-related parasomnias, for example to rule out sleep deprivation or other sleep disorders, like circadian sleep-wake rhythm disorder which often develops among shift workers.[22] However, there is currently no generally accepted standardized technique available of identifying and quantifying periodic limb movements in sleep (PLMS) that distinguishes movements resulting from parasomnias, nocturnal seizures, and other dyskinesias.[42] Eventually, using actigraphy for parasomnias in general is disputed.[43]

Treatment

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Parasomnias can be considered as potentially harmful to oneself as well as to bed partners, and are associated with other disorders.[22] Children with parasomnias do not undergo medical intervention, because they tend to recover the NREM-related disorder with the process of growth.[34] In those cases, the parents receive education on sleep hygiene to reduce and eventually eliminate precipitating factors.[34]

In adults psychoeducation about a proper sleep hygiene can reduce the risk to develop parasomnia.[22] Case studies have shown that pharmacological interventions can improve symptoms of parasomnia, however mostly they are accompanied by side-effects.[22][44] Behavioral treatments, i.e., relaxation therapy, biofeedback, hypnosis, and stress reduction, may also be helpful, but are not considered as universally effective.[44]

Prognosis

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NREM-related parasomnias which are common in childhood show a good prognosis, since severity decreases with age, the symptoms tend to resolve during puberty.[34][35] Adults with NREM-related parasomnias, however, are faced with a stronger persistence of the symptoms, therefore, full remission is quite unlikely and is also associated with violent complications, including homicide.[1][35] The variant sleep-related eating disorders is chronic, without remission, but treatable.[35]

REM sleep behavior disorder (RBD) can mostly be handled well with the use of melatonin or clonazepam.[25][35] However, there is high comorbidity with neurodegenerative disorders, that is in up to 93% of cases.[35] The underlying psychopathology of nightmare disorder complicates a clear prognosis.[35]

The prognosis for other parasomnias seems promising. While exploding head syndrome usually resolves spontaneously, the symptoms for sleep-related hallucinations tend to diminish over time.[35]

See also

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  • Alien abduction – Subjective experience of victimization by extraterrestrials
  • Dyssomnia – broad classification of sleeping disorders involving difficulty getting to sleep, remain sleeping, or of excessive sleepiness
  • Insomnia – Disorder causing trouble with sleeping
  • Rhythmic movement disorder – neurological disorder
  • Sleep medicine – Medical specialty devoted to the diagnosis and therapy of sleep disturbances and disorders
  • Sleep paralysis – Sleeping disorder

Notes

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  1. ^ a b c d e f g h i j k l m International Classification of Sleep Disorders. Darien, IL: American Academy of Sleep Medicine. 2014.
  2. ^ a b c d e f g h i j k Kazaglis, Louis; Bornemann, Michel A. Cramer (2016). "Classification of Parasomnias". Current Sleep Medicine Reports. 2 (2): 45–52. doi:10.1007/s40675-016-0039-y. ISSN 2198-6401.
  3. ^ Mahowald MW, Schenk CH. Dissociated states of wakefulness and sleep. In: Lydic R, Baghdoyan HA, editors. Handbook of behavioral state control: cellular and molecular mechanisms. Boca Raton: CRC Press; 1999. p. 143-58.
  4. ^ Mahowald MW, Schenk CH. dissociated states of wakefulness and sleep. Neurology. 1992; 42(7 Suppl 6):44-51.
  5. ^ Nobili, Lino; De Gennaro, Luigi; Proserpio, Paola; Moroni, Fabio; Sarasso, Simone; Pigorini, Andrea; De Carli, Fabrizio; Ferrara, Michele (2012), "Local aspects of sleep", The Neurobiology of Circadian Timing, Progress in Brain Research, vol. 199, Elsevier, pp. 219–232, doi:10.1016/b978-0-444-59427-3.00013-7, ISBN 9780444594273, PMID 22877668
  6. ^ Nobili, Lino; Ferrara, Michele; Moroni, Fabio; De Gennaro, Luigi; Russo, Giorgio Lo; Campus, Claudio; Cardinale, Francesco; De Carli, Fabrizio (2011). "Dissociated wake-like and sleep-like electro-cortical activity during sleep". NeuroImage. 58 (2): 612–619. doi:10.1016/j.neuroimage.2011.06.032. PMID 21718789. S2CID 357553.
  7. ^ Peter-Derex, Laure; Magnin, Michel; Bastuji, Hélène (2015). "Heterogeneity of arousals in human sleep: A stereo-electroencephalographic study". NeuroImage. 123: 229–244. doi:10.1016/j.neuroimage.2015.07.057. PMID 26220744. S2CID 207194956.
  8. ^ Bassetti, Claudio; Vella, Silvano; Donati, Filippo; Wielepp, Peter; Weder, Bruno (August 2000). "SPECT during sleepwalking". The Lancet. 356 (9228): 484–485. doi:10.1016/S0140-6736(00)02561-7. PMID 10981896. S2CID 35001207.
  9. ^ Peters, Brandon R. (2014-12-01). "Irregular Bedtimes and Awakenings". Sleep Medicine Clinics. 9 (4): 481–489. doi:10.1016/j.jsmc.2014.08.001. ISSN 1556-407X.
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  14. ^ "Sleep education".
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  16. ^ "R. v. Luedecke, 2008 ONCA 716". CanLII.org. October 17, 2008.
  17. ^ Ingravallo, Francesca; Poli, Francesca; Gilmore, Emma V.; Pizza, Fabio; Vignatelli, Luca; Schenck, Carlos H.; Plazzi, Giuseppe (2014-08-15). "Sleep-Related Violence and Sexual Behavior in Sleep: A Systematic Review of Medical-Legal Case Reports". Journal of Clinical Sleep Medicine. 10 (8): 927–935. doi:10.5664/jcsm.3976. ISSN 1550-9389. PMC 4106950. PMID 25126042.
  18. ^ Mahowald & Schenck. 1283.
  19. ^ "Sleepwalking". ADAM Medical Encyclopedia. ADAM Inc. 2012. Archived from the original on 28 August 2012.
  20. ^ Katugampola, M. (2005) Health & Human Development, Pearson Education.
  21. ^ a b American Psychiatric Association (2013). Diagnostic and Statistical Manual of Mental Disorders. American Psychiatric Publishing. ISBN 9780890425558. OCLC 1031488488.
  22. ^ a b c d e f g h i j k l m n o p q r s t u v w x y Fleetham, J. A.; Fleming, J. A. E. (2014-05-13). "Parasomnias". Canadian Medical Association Journal. 186 (8): E273–E280. doi:10.1503/cmaj.120808. ISSN 0820-3946. PMC 4016090. PMID 24799552.
  23. ^ O'Reardon, John P.; Peshek, Andrew; Allison, Kelly C. (2005). "Night eating syndrome". CNS Drugs. 19 (12): 997–1008. doi:10.2165/00023210-200519120-00003. ISSN 1172-7047. PMID 16332142. S2CID 25478218.
  24. ^ Das, John; Johal, Arminder; Stahl, Stephanie (20 April 2024). "Importance of Arm Electromyography for REM Without Atonia Detection". SLEEP. 47 (1): A513–A514. doi:10.1093/sleep/zsae067.01204.
  25. ^ a b c d e McCarter, S., & Howell, J. (2017). REM Sleep Behavior Disorder and Other Sleep Disturbances in Non-Alzheimer Dementias. Current Sleep Medicine Reports, 3(3), 193-203.
  26. ^ Aurora, R., Zak, R., Maganti, R., Auerbach, S., Casey, K., Chowdhuri, S., . . . Morgenthaler, T. (2010). Best practice guide for the treatment of REM sleep behavior disorder (RBD). Journal of Clinical Sleep Medicine : JCSM : Official Publication of the American Academy of Sleep Medicine, 6(1), 85-95.
  27. ^ a b c Bjørnarå, Dietrichs, & Toft. (2013). REM sleep behavior disorder in Parkinson's disease – Is there a gender difference? Parkinsonism and Related Disorders, 19(1), 120-122.
  28. ^ a b c Bjørnarå, K., Dietrichs, E., & Toft, M. (2015). Longitudinal assessment of probable rapid eye movement sleep behaviour disorder in Parkinson's disease. European Journal of Neurology, 22(8), 1242-1244.
  29. ^ Dauvilliers, B., Yves, Postuma, Livia, Ronald, Ferini-Strambi, Livia, Luigi, Arnulf, Livia, Isabelle, Högl, Livia, Birgit, Manni, Livia, Raffaele, . . . Montplaisir, Livia, Jacques. (2013). Family history of idiopathic REM behavior disorder: A multicenter case-control study. Neurology, 80(24), 2233-2235.
  30. ^ Boeve, B. F.; Silber, M. H.; Saper, C. B.; Ferman, T. J.; Dickson, D. W.; Parisi, J. E.; Benarroch, E. E.; Ahlskog, J. E.; Smith, G. E. (2007-04-05). "Pathophysiology of REM sleep behaviour disorder and relevance to neurodegenerative disease". Brain. 130 (11): 2770–2788. doi:10.1093/brain/awm056. ISSN 0006-8950. PMID 17412731.
  31. ^ Eichelberger, Hillary; Lindo, Ryan O.; Rodriguez, Alcibiades J. (2023-10-01). "Differential diagnosis of sleep laughter: A case report and literature review". Sleep Medicine. 110: 231–234. doi:10.1016/j.sleep.2023.08.018. ISSN 1389-9457.
  32. ^ a b Trajanovic, Nikola N.; Shapiro, Colin M.; Milovanovic, Srdjan (July 2013). "Sleep-laughing--hypnogely". The Canadian Journal of Neurological Sciences. Le Journal Canadien Des Sciences Neurologiques. 40 (4): 536–539. doi:10.1017/s0317167100014621. ISSN 0317-1671. PMID 23786736.
  33. ^ Sharpless, Brian A.; Barber, Jacques P. (2011). "Lifetime prevalence rates of sleep paralysis: A systematic review". Sleep Medicine Reviews. 15 (5): 311–315. doi:10.1016/j.smrv.2011.01.007. PMC 3156892. PMID 21571556.
  34. ^ a b c d Singh, Shantanu; Kaur, Harleen; Singh, Shivank; Khawaja, Imran (2018-12-31). "Parasomnias: A Comprehensive Review". Cureus. 10 (12): e3807. doi:10.7759/cureus.3807. ISSN 2168-8184. PMC 6402728. PMID 30868021.
  35. ^ a b c d e f g h "Parasomnias in adults Prognosis - Epocrates Online". online.epocrates.com. Retrieved 2019-06-29.
  36. ^ "Alaska Sleep Clinic". Archived from the original on 2019-06-23. Retrieved 2019-06-23.
  37. ^ a b c d Silber, M. H., St. Louis, E. K., & Boeve, B. F. (2017). Rapid Eye Movement Sleep Parasomnias. In Principles and Practice of Sleep Medicine (p. 993-1001.e6). https://doi.org/10.1016/B978-0-323-24288-2.00103-3
  38. ^ a b Vreugdenhil, S., Weidenaar, A. C., de Jong, I. J., & van Driel, M. F. (2018). Sleep-Related Painful Erections: A Meta-Analysis on the Pathophysiology and Risks and Benefits of Medical Treatments. The Journal of Sexual Medicine, 15(1), 5‑19. https://doi.org/10.1016/j.jsxm.2017.11.006
  39. ^ Ivanenko, Anna; Relia, Sachin (2013), Kothare, Sanjeev V.; Ivanenko, Anna (eds.), "Sleep-Related Hallucinations", Parasomnias, Springer New York, pp. 207–220, doi:10.1007/978-1-4614-7627-6_14, ISBN 9781461476269
  40. ^ Hilditch, Cassie J.; McHill, Andrew W. (2019-08-22). "Sleep inertia: current insights". Nature and Science of Sleep. 11: 155–165. doi:10.2147/nss.s188911. PMC 6710480. PMID 31692489.
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  42. ^ Chokroverty, Sudhansu; Thomas, Robert J. (2014), "Specialized Techniques", Atlas of Sleep Medicine, Elsevier, pp. 255–299, doi:10.1016/b978-1-4557-1267-0.00014-x, ISBN 9781455712670
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  44. ^ a b "Disorders That Disrupt Sleep: Parasomnia Causes & Types". eMedicineHealth. Retrieved 2019-06-23.

References

[edit]
  • Aurora RN et al. Journal of Clinical Sleep Medicine 2010; 6(1):85-95.
  • Aurora RN et al. Journal of Clinical Sleep Medicine 2010; 6(4):398-401.
  • Bassetti et al., Lancet (2000); 356: 484–485
  • Boeve et al. Journal of Geriatr Psychiatry Neurol 2004; 17:146-157
  • Mahowald & Schenck. Insights from studying human sleep disorders. Nature (2005); 437(7063):1279-85.

Further reading

[edit]
  • Siegel, Ronald (1992). Fire in the Brain: Clinical Tales of Hallucination.
  • Warren, Jeff (2007). The Head Trip: Adventures on the Wheel of Consciousness. Random House. ISBN 978-0-679-31408-0.
[edit]
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