Sleep on it: Everything will look better in the morning

Over the 120 years since the first published report on experimental sleep deprivation in humans (1), a clear and reliable outcome has been that sleep loss leads to changes in subjective mood (2). These robust findings have typically been described as lower positive mood and higher negative mood reports on adjective checklists or visual analog scales, and on the more recently employed Profile of Mood States (POMS) and Positive and Negative Affect Scale (PANAS) questionnaires. Yet remarkably, sleep researchers have only recently begun to try to understand the mechanisms underlying altered mood and emotional states during sleep loss conditions.

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