Psychosomatic Medicine 36:164-173 (1974)
© 1974 American Psychosomatic Society

Acute Shifts in the Sleep-Wakefulness Cycle: Effects on Performance and Mood

¹ Postdoctoral Fellow, The Neuropsychiatric Institute, UCLA Center for the Health Sciences Los Angeles, California 90024

Address for reprint requests: Dr. Ralph J. Berger, Thimann Laboratories, University of California, Santa Cruz, California 95064

Ten regular 12-8 a.m. 8-hour sleepers performed a 5-min experimenter-paced calculation task, a 30-min vigilance task and completed an adjective check list to rate their mood following a 12-8 a.m. habitual sleep condition and 8 p.m.-4 a.m., 10 p.m.-6 a.m., 2-10 a.m., and 4 a.m.-12 p.m. conditions of shifted sleep. After the shifted sleep conditions compared to the 12-8 a.m. condition performance on the vigilance and calculation tasks was significantly impaired, and negative affect was significantly greater as measured by three scales of the adjective check list. Sleep length did not differ between the various conditions and the decrements in performance and mood were unrelated to any specific changes in the electrophysiological patterns of sleep.

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