Adverse Effects of Modest Sleep Restriction on Sleepiness, Performance, and Inflammatory Cytokines

Alexandros N. Vgontzas, E. Zoumakis, E. O. Bixler, H. M. Lin, H. Follett, A. Kales, G. P. Chrousos

Research output: Contribution to journalArticlepeer-review

809 Scopus citations


Total sleep restriction in humans is associated with increased daytime sleepiness, decreased performance, and hormonal/metabolic disturbances. The effects of mild chronic sleep restriction that mimic real life are not known. To assess the effects of modest sleep restriction from 8 to 6 h/night for I wk, 25 young, healthy, normal sleepers (12 men and 13 women) were studied for 12 consecutive nights in the sleep laboratory. After I wk of sleep restriction, although subjects' nighttime sleep was deeper, subjects were significantly sleepier (multiple sleep latency test) and performed worse in four primary variables of psychomotor vigilance test (both P < 0.01). Furthermore, 24-h secretion of IL-6 was increased by 0.8 ± 0.3 pghnl (P < 0.05) in both sexes, whereas TNFα was increased only in men. Also, the peak cortisol secretion was lower after sleep restriction than at baseline, and this difference was stronger in men (55.18 ± 24.83 nmol/liter; P < 0.05) than in women (35.87 ± 24.83 nmol/liter; P < 0.16). We conclude that in young men and women, modest sleep loss is associated with significant sleepiness, impairment of psychomotor performance, and increased secretion of proinflammatory cytokines. Given the potential association of these behavioral and physical alterations with health, well-being, and public safety, the idea that sleep or parts of it are optional should be regarded with caution.

Original languageEnglish (US)
Pages (from-to)2119-2126
Number of pages8
JournalJournal of Clinical Endocrinology and Metabolism
Issue number5
StatePublished - May 2004

All Science Journal Classification (ASJC) codes

  • Endocrinology, Diabetes and Metabolism
  • Biochemistry
  • Endocrinology
  • Clinical Biochemistry
  • Biochemistry, medical


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