Independence of the circadian rhythm in alertness from the sleep/wake cycle.

Abstract:

:It is common knowledge that our feelings of alertness or drowsiness vary throughout the day. Indeed, this diurnal variation is so widely accepted that it has been used to validate the drowsy/alert component of activation obtained from mood adjective checklists. There is, however, some evidence from sleep deprivation and shiftwork studies that this variation is not simply a reflection of our sleep/wake cycle, as might be expected, but is at least partially dependent on an endogenous circadian (approximately 24 h) oscillator such as that proposed to account for the circadian rhythm in body temperature and other physiological variables. Here we have tested this suggestion by separating the body-temperature rhythm from the sleep/wake cycle by progressively shortening artificial time cues (zeitgebers). Our results indicate that the circadian rhythm in alertness can become independent of both the sleep/wake cycle and the rhythm in body temperature. Further, and contrary to our expectations, the results suggest that the sleep/wake cycle exerts less influence on the alertness rhythm than it does on that of temperature.

journal_name

Nature

journal_title

Nature

authors

Folkard S,Hume KI,Minors DS,Waterhouse JM,Watson FL

doi

10.1038/313678a0

subject

Has Abstract

pub_date

1985-02-21 00:00:00

pages

678-9

issue

6004

eissn

0028-0836

issn

1476-4687

journal_volume

313

pub_type

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