Psychosomatic Medicine 31:528-535 (1969)
© 1969 American Psychosomatic Society

A Syndrome Associated with Sleeping Late

¹ Department of Psychiatry and Human Behavior, College of Medicine, University of California Irvine Irvine, Calif 92664Clinical Research Branch, Division of Extramural Research Programs, National Institute of Mental Health

A syndrome sometimes associated with sleeping late is identified in a student population. It is recognized as feelings of being worn-out, tired, lethargic, and irritable, with fuzzy thinking and difficulty in getting going. When it occurs, it tends to last for an average of 4.4 hr. This syndrome is particularly marked following sleep of 10 or more hr when the individual is not making up a sleep deficit. Under these conditions, the worn-out syndrome is more typical than feeling just great. These data suggest the testable hypothesis that optimal durations of sleep fall into a relatively narrow band and that disruptive psycho-physiological effects are sustained with both too much and too little sleep.

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