Sleep: The golden chain for mental health1 December 2017
Winter is here, and whether or not you enjoy the darker evenings, colder weather and premature Christmas decorations in shops, most will rejoice at the extra hour in bed that marks the change from British Summer Time to Greenwich Mean Time.
The ‘praise of sleep’
Extolling the virtues of sleep is not a modern phenomenon. Over 400 years ago, Thomas Dekker dedicated a chapter of his 1609 work, The Guls Horne-booke, to ‘The praise of sleep and of going naked’. Dekker’s musings on nakedness are another matter, however, he aptly described sleep as ‘that golden chain that ties health and our bodies together’ noting that ‘too little tumbles us into a Church-yard, and to use it but indifferently, throws us into Bedlam’.
Much scientific research has since shown that sleep is crucial for physical and mental well being, affecting multiple processes in our bodies from memory to metabolism. My research focuses on how sleep affects mental health.
Sleep disturbance as a symptom of mental illness
In the 19th century, Emil Kraepelin, considered the grandfather of modern psychiatry, noted that sleep disturbances were common in patients with psychiatric disorders and recommended treatments that promoted sleep.
Today, the diagnostic systems used in research and clinical practice mirror Kraepelin’s observations. For example, the fifth version of the Diagnostic and Statistical Manual of Mental Disorders includes sleep disturbance as a symptom of bipolar disorder, major depressive disorder and anxiety disorders.
However, the question of whether poor sleep ‘throws us into Bedlam’ (i.e. causes mental ill health) has received relatively little attention until more recently.
Does sleep loss ‘throw us into Bedlam’?
There has been a growing interest in whether sleep problems can be a cause as well as a symptom of mental illness. For example, epidemiological studies suggest that people with insomnia are at a heightened risk of depression, and periods of sleep deprivation have been associated with the onset of manic episodes in people with bipolar disorder (Wehr, 1989; Plante and Winkelman, 2008). These associations have been supported by evidence from experimental studies. For example, Gessa and colleagues reported that rats displayed manic-like behaviours following sleep deprivation and other studies have found sleep deprivation in humans to lead to deficits in emotion processing and psychosis-like symptoms.
Implications for clinical practice
Understanding more about how sleep problems influence the course of psychiatric disorders could greatly facilitate efforts to treat mental ill-health. For example, interventions that aim to improve sleep have been associated with improving symptoms of depression, reducing the risk of relapse in bipolar disorder, and reducing paranoia and hallucinatory experiences.
In spite of considerable progress in this area of research, there is still much more we need to investigate about the relationship between sleep and mental health.
First, psychiatric illnesses are complex and caused by a variety of genetic and environmental factors, therefore poor sleep may not be a risk factor for everyone. For example, in a study of over 3000 people with bipolar disorder, we found that 20% of participants reported that sleep loss had triggered episodes of high mood, with women more likely to report this than men.
Second, our sleep patterns are influenced by numerous factors which further complicate attempts to understand the relationship between poor sleep and mental health. One influence, recently highlighted in the Nobel prize awards, is our circadian rhythms (24-hour rhythms in our physiology and behaviour). These rhythms influence the sleep-wake cycle and are affected by factors such as light exposure, behaviour and genetic variation.
Current research and future directions
At the National Centre for Mental Health and MRC Centre for Neuropsychiatric Genetics and Genomics, we are exploring the relationship between sleep and mental health using a variety of methods. For example, we are using genetic data from a study of over 6,000 people with bipolar disorder to investigate whether genetic risk for sleep problems is associated with different features of bipolar disorder. We are also exploring the long-term relationships between sleep and mood using activity monitors and daily diaries.
The relationship between sleep and mental health is complex, therefore progress in this area requires researchers to consider the influence of behaviour, biology and environment. Such complexities make unravelling the links in the ‘golden chain’ a challenging but exciting area of research that could ultimately aid the understanding and treatment of psychiatric disorders. If Dekker were alive, he might be pleased to hear that his writings on sleep (if not nakedness) are still relevant today.
Find out more about how you can take part in our sleep research
We also run workshops on the science of sleep which are advertised through our Facebook page.
- February 2020
- September 2019
- August 2019
- July 2019
- June 2019
- May 2019
- April 2019
- March 2019
- February 2019
- January 2019
- November 2018
- October 2018
- September 2018
- August 2018
- July 2018
- June 2018
- May 2018
- February 2018
- December 2017
- November 2017
- October 2017
- September 2017
- August 2017
- July 2017
- June 2017
- May 2017
- April 2017
- March 2017
- February 2017
- January 2017
- December 2016
- November 2016
- October 2016
- September 2016
- August 2016
- July 2016
- June 2016
If you are interested in contributing to the Cardiff Mental Health blog, please contact us for further information
By posting, you’ll be contributing to independent, fact-based debate. We want the discussion of an article to be, if anything, more illuminating than the original article and we need your help to do that. Follow these guidelines to help keep things on track.
Comments are closed.