Reciprocal relationships between daily sleep and mood: A systematic review of naturalistic prospective studies

An intimate relationship exists between sleep and affective states. Disturbances in sleep are common across a spectrum of psychopathologies, and are recognised as precipitating or prodromal factors for mood disorders. Conversely, affective states can impact sleep quality and ability to fall asleep. However, one of the main limitations of this literature is that studies have typically assessed sleep and mood at one time point and studies are often laboratory-based, where measurement of both sleep and mood has dubious ecological validity.

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