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Sleep, Circadian Rhythm, and Mental Health

Neuroscience News

Summary: A new study highlights the critical link between sleep, circadian rhythms, and psychiatric disorders, suggesting that disturbances in sleep and internal body clocks can trigger or exacerbate mental health issues. The research underscores the prevalence of sleep-circadian disturbances across all psychiatric disorders, pointing to the need for holistic treatments that address these factors.

The review emphasizes the potential of new therapeutic approaches, such as light therapy and cognitive behavioral therapy for insomnia (CBT-I), to improve mental health outcomes. This work, incorporating insights from an international team, marks a step forward in understanding and treating psychiatric conditions by focusing on sleep and circadian science.

Key Facts:

1. Prevalence of Sleep-Circadian Disturbances: Sleep and circadian rhythm disturbances are commonly found across psychiatric disorders, with significant impacts on conditions like insomnia, bipolar disorder, and early psychosis.

2. Potential Mechanisms: The review explores mechanisms such as genetic predispositions, exposure to light, and changes in neuroplasticity that contribute to the link between sleep-circadian disturbances and psychiatric disorders.

3. Therapeutic Approaches: Highlighting the effectiveness of treatments like light therapy and CBT-I, the review suggests targeting sleep and circadian factors could lead to innovative treatments for psychiatric conditions.

Source: University of Southampton

Problems with our sleep and internal body clock can trigger or worsen a range of psychiatric disorders, according to a new review of recent research evidence.

The review, published today [19 February] in Proceedings of the National Academy of Sciences (PNAS), suggests gaining a better understanding of the relationship between sleep, circadian rhythms and mental health could unlock new holistic treatments to alleviate mental health problems.

“Sleep-circadian disturbances are the rule, rather than the exception, across every category of psychiatric disorders,” says Dr Sarah L. Chellappa from the University of Southampton, senior author of the review. “Sleep disturbances, such as insomnia, are well understood in the development and maintenance of psychiatric disorders, but our understanding of circadian disturbances lags behind.

“It is important to understand how these factors interact so we can develop and apply sleep-circadian interventions that benefit the sleep and mental health symptoms of patients.”

An international team of researchers from the University of Southampton, Kings College London, Stanford University and other institutions explored recent evidence on sleep and circadian factors, focusing on adolescents and young adults with psychiatric disorders. This is a time when people are most at risk of developing mental health disorders and when disruption to sleep and circadian rhythms are likely to occur.


Insomnia is more common in people with mental health disorders than in the general population – during remission, acute episodes and especially in early psychosis, where difficulty falling and staying asleep affects over half of individuals.

Around a quarter to a third of people with mood disorders have both insomnia and hypersomnia, where patients find it hard to sleep at night, but are sleepier in the daytime. Similar proportions of people with psychosis experience this combination of sleep disorders.

Meanwhile, the few studies looking at circadian rhythm sleep-wake disorders (CRSWD) suggest that 32 per cent of patients with bipolar disorder go to sleep and wake later than usual (a condition called Delayed Sleep-Wake Phase Disorder). Body clock processes (such as endogenous cortisol rhythms) have been reported to run seven hours ahead during manic episodes and four to five hours behind during the depressive phase. Timing is normalized upon successful treatment.


What are the mechanisms?

The researchers examined the possible mechanisms behind sleep-circadian disturbances in psychiatric disorders. During adolescence, physiological changes in how we sleep combine with behavioral changes, such as staying up later, getting less sleep on school nights and sleeping in on weekends.

Dr Nicholas Meyer, from King’s College London, who co-led the review said: “This variability in the duration and timing of sleep can lead to a misalignment between our body clock and our sleep-wake rhythms can increase the risk of sleep disturbances and adverse mental health outcomes.”

Researchers also looked at the role of genes, exposure to light, neuroplasticity and other possible factors. Those with a genetic predisposition towards a reduced change in activity levels between rest and wake phases are more likely to experience depression, mood instability, and neuroticism. Population-level surveys show self-reported time outdoors was associated with a lower probability of mood disorder. Sleep is thought to play a key role in how the brain forms new neural connections and processes emotional memories.

Dr Chellappa said: “Collectively, research into mental health is poised to take advantage of extraordinary advances in sleep and circadian science and translate these into improved understanding and treatment of psychiatric disorders.”



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