A longer biological night in long sleepers than in short sleepers

  • Aeschbach D
  • Sher L
  • Postolache T
 et al. 
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Habitual sleep duration varies greatly among individuals. The physiological basis of this variation is unknown. We sought to determine whether individual differences in sleep duration are associated with systematic differences in the duration of the biological night that is programmed by the circadian pacemaker and reflected in the nocturnal interval of circadian rhythms in neuroendocrine function, body temperature, and arousal. Ten young, healthy long sleepers (sleep duration >9 h) and 14 short sleepers (

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  • Daniel Aeschbach

  • Teodor T. Postolache

  • Jeffery R. Matthews

  • Michael A. Jackson

  • Thomas A. Wehr

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