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Disturbance of the circadian rhythm is a feature of a number of psychological problems such as depression, PTSD, OCD etc. The significance of the correlation is if any is unclear.

• Does disturbance of the CR mechanism with its lack of sleep etc bring on or exacerbate the conditions.

• Do aspects of the problems themselves lead to disturbance of the CR. Worrying in OCD leading to lack of sleep and a shift in CR.?

• Or are there mechanisms common to both CR and the psychological conditions that underpin them both. For example the locus coreleus is associated with both depression and the sleep-wake cycle.

• Depression, sleep and the circadian rhythm
• Psychosis, sleep and the circadian rhythm
• PTSD, sleep and the circadian rhythm
• OCD, sleep and the circadian rhythm

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