Mental health and circadian rhythm

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