To sleep on it - REM sleep, mood disorders and emotional processing
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- Institutt for psykologi 
The aim of the current thesis was to review research on the relationship between REM sleep and mood disorders. The paper further addresses possible mechanisms that might mediate such a relationship. Two relevant theories regarding REM sleep and mood are discussed, the “floor and ceiling” hypothesis and the “sleep to forget, sleep to remember” hypothesis. Research shows that polysomnographic (PSG) measures of patients meeting the criteria of depression often have distinct changes in sleep architecture compared to controls. Experimental research where either sleep or mood has been manipulated indicates that REM sleep might play a central role in emotional processing. Emotional processing might thus represent a possible mechanism by which REM sleep and mood disorders are related. The research presented support such a relation. Research on the relation between REM sleep and mood disorders is still limited, and further research is needed before a certain conclusion upon the mechanisms mediating the relation between REM sleep and mood disorders can be drawn.