Cited by 1,087Sleep and Wakefulness ResearchSleep and related disordersNeuroscience of respiration and sleep

Overnight therapy? The role of sleep in emotional brain processing

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Walker, Matthew P., van der Helm, Els·2009·Psychological Bulletin

Abstract

Cognitive neuroscience continues to build meaningful connections between affective behavior and human brain function. Within the biological sciences, a similar renaissance has taken place, focusing on the role of sleep in various neurocognitive processes and, most recently, on the interaction between sleep and emotional regulation. This review surveys an array of diverse findings across basic and clinical research domains, resulting in a convergent view of sleep-dependent emotional brain processing. On the basis of the unique neurobiology of sleep, the authors outline a model describing the overnight modulation of affective neural systems and the (re)processing of recent emotional experiences, both of which appear to redress the appropriate next-day reactivity of limbic and associated autonomic networks. Furthermore, a rapid eye movement (REM) sleep hypothesis of emotional-memory processing is proposed, the implications of which may provide brain-based insights into the association between sleep abnormalities and the initiation and maintenance of mood disturbances.

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Crossref · 10.1037/a0016570

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  • REM sleep and its main oscillatory feature, frontal theta, play a critical role in the processing of recent and emotional memories.

    “Rapid eye movement (REM) sleep and its main oscillatory feature, frontal theta, play a critical role in the processing of recent and emotional memories (for reviews, see Walker, 2009; Walker and van der Helm, 2009; Genzel et al., 2015; Hutchison and Rathore, 2015).”

    From Incorporation of recent waking-life experiences in dreams correlates with frontal theta activity in REM sleep (2018) · cites this paper as Walker and van der Helm, 2009

    In “Sleep and Affective Memory Consolidation” (page unavailable), the review reports that prefrontal theta power during REM sleep correlated with improvement in emotional memory. Its heuristic-model section (page unavailable) proposes that REM theta may help integrate recently experienced emotional events. These passages support a role for REM sleep and frontal theta, but describe the mechanism tentatively rather than establishing that both play a critical role. (LLM, conf=0.82)

    Experimental — accuracy not yet measured
  • The failure of this reduction during REM sleep has been found in anxiety disturbances associated with the presence of higher gamma activity, contributing to hyperarousal and amygdala reactivity.

    “the failure of this reduction during REM sleep has been found in anxiety disturbances associated to the presence of higher gamma activity, contributing to hyperarousal and amygdala reactivity”

    From The Functional Role of Dreaming in Emotional Processes (2019) · cites this paper as Walker and van der Helm, 2009

    The “Predictions of the model” section proposes that REM sleep may fail to reduce emotional responses in PTSD and that hyperarousal during REM could prevent this processing; it does not present this as an established finding. The “Sleep” section describes gamma activity as a feature of REM sleep generally, not as elevated in anxiety disturbances or as a cause of hyperarousal and amygdala reactivity. Page numbers are unavailable in our copy. (LLM, conf=0.85)

    Experimental — accuracy not yet measured
  • The adrenergic reduction during REM sleep is essential to emotional regulation because of its role in defusing affective experiences and decreasing emotional intensity.

    “the adrenergic reduction during REM sleep is essential to emotional regulation because of its role in defusing affective experiences and decreasing emotional intensity”

    From The Functional Role of Dreaming in Emotional Processes (2019) · cites this paper as Walker and van der Helm, 2009

    The “Sleep” section describes strongly inhibited noradrenergic activity during REM sleep. In “Emotional memory processing: Time (wake) vs. sleep,” the authors propose that processing without adrenergic influence may reduce a memory’s associated autonomic charge. The claim presents this proposed mechanism as an established, essential role in emotional regulation; the cited passages do not establish that necessity. Page numbers were not provided in our copy. (LLM, conf=0.86)

    Experimental — accuracy not yet measured
  • Gamma activity could represent a marker of the suppression of central adrenergic neurotransmitters in REM sleep involved in the encoding of emotional salient events along with activation in the amygdala-hippocampal system.

    “the gamma activity could represent a marker of the suppression of central adrenergic neurotransmitters in REM sleep (also implicated in arousal and stress) involved in the encoding of emotional salient events along with activation in amygdala-hippocampal system”

    From The Functional Role of Dreaming in Emotional Processes (2019) · cites this paper as Walker and van der Helm, 2009

    The Sleep section describes gamma activity during REM sleep and separately says that aminergic activity is strongly inhibited, but it does not identify gamma activity as a marker of that inhibition. The Emotional Memory Encoding section links amygdala–hippocampal co-activation to encoding emotional events; the paper does not link that encoding to REM gamma activity. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • Some dream and/or REM abnormalities represent core symptoms of psychiatric and sleep disorders.

    “It should be emphasized that this evidence may afford insights for the translational research since that some dream and/or REM abnormalities represent the core symptoms of psychiatric and sleep disorders (Benca et al., 1992, 1997; Harvey, 2008; Walker and van der Helm, 2009).”

    From The Functional Role of Dreaming in Emotional Processes (2019) · cites this paper as Walker and van der Helm, 2009

    The “Sleep and mood disorders” and “Post-traumatic stress disorder” sections describe REM abnormalities in depression and dream-related experiences as a diagnostic feature of PTSD. They do not establish that dream or REM abnormalities are core symptoms of sleep disorders as a separate category. Page numbers were not available in our copy. (LLM, conf=0.84)

    Experimental — accuracy not yet measured

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Authors
Walker, M. P., & van der Helm, E.
Affiliations
University of California, Berkeley (US)
Venue
Psychological Bulletin
Published
2009
Volume
135
Issue
5
Pages
731-748
ISSN
  • 0033-2909 (ISSN-L)
  • 1939-1455
OpenAlex
W2147396017
Cited by
1,087
References
178
Citations by year
2026: 109 · 2025: 85 · 2024: 66 · 2023: 52 · 2022: 79 · 2021: 75 · 2020: 77 · 2019: 67 · 2018: 53 · 2017: 60 · 2016: 60 · 2015: 72 · 2014: 57 · 2013: 66 · 2012: 50
FWCI
17.48
Type
journal article
Language
en
Open access
Locations
  • Psychological Bulletin (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Institutes of Health (MH069935)
  • American Academy of Sleep Medicine
Topics
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Sleep and Wakefulness Research
  • Social Sciences › Psychology › Experimental and Cognitive Psychology › Sleep and related disorders
  • Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Neuroscience of respiration and sleep
Keywords
sleep, emotional processing, emotion regulation, sleep-dependent memory consolidation, emotional memory, REM sleep, limbic system, autonomic nervous system, mood disturbance, sleep abnormalities, emotional behavior
MeSH terms
Affect, Brain, Cognition, Emotions, Humans, Memory, Sleep, Sleep, REM

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