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Sleep and emotions

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Emotions play a key role in overall mental health,[1] and sleep plays a crucial role in maintaining the optimal homeostasis of emotional functioning.[2][3] Deficient sleep, both in the form of sleep deprivation and restriction, adversely impacts emotion generation, emotion regulation, and emotional expression.[4]

Models of sleep loss and emotional reactivity

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Scientists offer two explanations for the effects of sleep loss on emotions. One explanation is that sleep loss causes disinhibition of emotional brain regions, leading to an overall increase in emotional intensity[5] (also referred to as Dysregulation Model). The other explanation describes how sleep loss causes an increase in fatigue and sleepiness, coupled with an overall decrease in energy and arousal, leading to an overall decrease in emotional intensity[6] (also referred to as Fatigue Model).

The dysregulation model

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The dysregulation model is supported by neuroanatomical, physiological, and subjective self-report studies. Emotional brain regions (e.g. the amygdala) have shown 60% greater reactivity to emotionally negative photographs following one night of sleep deprivation, as measured by functional magnetic resonance imaging.[5] Five days of sleep restriction (four hour sleep opportunity per night) caused a decrease in connectivity with cortical brain regions involved in the regulation of the amygdala.[7] Pupil diameter was shown to increase significantly in response to negative photographs following sleep deprivation.[8] When exposed to positive stimuli, sleep deprived participants showed amplified emotional reactivity throughout various midbrain, striatal, limbic, and visual processing brain regions.[9] One night of sleep deprivation caused participants to judge neutral images more negatively than non sleep deprived participants.[10] One night of sleep loss also caused increased impulsivity to negative stimuli.[11]

The fatigue model

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The fatigue-model is supported by subjective self-report and physiological studies. Arousal, as measured by electroencephalograph (EEG), decreases as sleep loss increases,[6] leading to a decrease in the desire to perform and exert effort. Short-term sleep loss is associated with blunting in the recognition of negative and positive facial expressions.[12] Various forms of emotional expression, including facial and vocal expression, are adversely affected by sleep loss. Following one night of sleep deprivation, participants show decreased facial expressiveness in response to positive stimuli,[13] as well as decreased vocal expression of positive emotion.[14] Sleep deprivation slows the generation of facial reactions in response to emotional faces.[15] One to two nights of sleep loss in healthy adults is associated with a decrease in the generated intensity of positive moods (i.e. happiness and activation), as well as an increase in the generated intensity of negative moods (i.e. anger, depression, fear, and fatigue). Long-term chronic exposure to insufficient sleep is associated with a decline in optimism and sociability, and an increase in subjective experiences of sleepiness and fatigue.[16] Furthermore, sleep restricted to five hours a night over the course of a week causes significant increases in self-reports of subjective mood disturbance and sleepiness.[17]

Sleep, emotions, and psychiatric ailments

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Deficient sleep patterns are prominent in many psychiatric ailments.[18] Insomnia increases the risk of a depressive episode, sleep deprivation influences the onset of hypomania, and sleep disturbance contributes to the maintenance of mood disorders.[19] Amongst manic bipolar patients, sleep loss may act as a trigger in the onset of a manic episode.[20] 

Sleep patterns are affected by behavioral and emotional disorders, and aspects of emotional and cognitive well-being are influenced by sleep patterns.[21] Scientists have examined the effects of deficient sleep patterns on emotion regulation in individuals diagnosed with mental disorders ( e.g. depression and anxiety),[22] borderline personality disorder, bipolar disorder,[19] and panic disorder.[23] Methods typically include observational, subjective, behavioral, and physiological measures of emotional functioning.[24]

Emotion regulation difficulties are associated with greater symptoms of depression, anxiety,[25] and borderline personality, that worsen with poor sleep patterns. Heart rate variability (HRV) is described as the time interval between heartbeats, and is linked to emotion regulation capacity,[26] with higher resting HRV is associated with greater emotion regulation capacity, and lower resting HRV is associated with low emotion regulation capacity.[27] Physiological data suggests that HRV is negatively affected by sleep loss,[24] as seen in panic disorder patients with poor sleep quality who display increased cognitive inhibition due to reduced HRV.[23] Emotion dysregulation has also been shown to play a role in the maintenance of generalized anxiety disorder,[28] panic disorder,[29] obsessive-compulsive disorder,[30] and posttraumatic stress disorder.[31] Overall deficient sleep plays a role in dampening emotions in clinical populations already susceptible to emotion dysregulation, as well as maintaining various psychiatric conditions through contributing to emotion dysfunction.[32]

Children and emotional Development

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Several important emotional characteristics that develop in childhood have been linked to sleep quality and duration, for example approachability, adaptability and attachment.[33] Sleep disruption has been argued to play a role in crying frequency. Crying was interpreted as an early form of a behavioral dysregulation and has therefore been linked to emotion regulation.[34]

Dreaming as a Mood-Regulation System

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It is hypothesized that dreaming might be a way of improving mood in non-clinical populations.[35] The evidence for this phenomenon has been collected from home dream reports in psychotherapy and from laboratory dreams collected after waking a participant in a REM sleep phase.[36] Adults often remember dreams which have a negative emotional component, whereby women recall more dreams than men and dream recall is associated with a higher level of anxiety and lighter sleep.[37]

Dreams after Stress

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In a study [38] conducted with depressed and healthy adults and were able to show that in healthy subjects, dreaming was a way to positively influence mood and cope with stress at night. Dreams of depressed persons, however, might deteriorate their mood further. This study's interesting results are limited in generalizability due to the small sample and the lack of reported dreams by depressed patients.

Emotions are more apparent in stages of REM-sleep rather than other stages of sleep. [39] It was found that during REM-sleep negative emotions diminish.[39] After going through stages of REM-sleep, people with depression report feeling better, in a study done by Cartwright et al.[40] Conversely, a theory proposed by Revonsuo[41] states that when people experience negative emotions or negative events, when they sleep the REM-sleep replays such events, which is known as rehearsal.[39] During REM-sleep areas of the brain, the suborbital area, and the cortical area are responsible for emotion but also a suppression of arousing emotions are activated.[39] Scientists noticed a decrease in the hormone noradrenaline which is released into the body after a highly stimulating event.[39] People reported trouble falling asleep or sleeping consistently throughout the night when a stressful event was happening in their life, as observed by Åkerstedt.[42] REM-sleep aids people with negative emotion or high stress.[39]

Circadian Rhythm and Emotions

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The circadian rhythm provides a person with a signal for when to sleep and when to wake up.[43] If circadian rhythm and sleep-wake cycle are misaligned, this might lead to negative affect and emotional instability.[44] It has been found that emotions vary depending on the circadian rhythm and the duration of how long one was awake.[45] Circadian sleep-rhythm disorders like shift-work disorder or Jetlag-disorder have been found to similarly contribute to the Dysregulation of affect, with symptoms like irritability, anxiety, apathy and dysphoria.[46]

References

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  45. ^ Boivin, Diane B. (1997-02-01). "Complex Interaction of the Sleep-Wake Cycle and Circadian Phase Modulates Mood in Healthy Subjects". Archives of General Psychiatry. 54 (2): 145–52. doi:10.1001/archpsyc.1997.01830140055010. ISSN 0003-990X. PMID 9040282.
  46. ^ Borodkin, Katy; Dagan, Yaron (2010), "Circadian rhythm disorders", Foundations of Psychiatric Sleep Medicine, Cambridge University Press, pp. 186–202, doi:10.1017/cbo9780511777493.013, ISBN 9780511777493
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