Electroencephalogram Power Density and Slow Wave Sleep as a Function of Prior Waking and Circadian Phase

Derk-Jan Dijk, Daniel P. Brunner, Domien G.M. Beersma, Alexander A. Borbély

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Abstract

Human sleep electroencephalograms, recorded in four experiments, were subjected to spectral analysis. Waking prior to sleep varied from 12 to 36 h and sleep was initiated at different circadian phases. Power density of delta and theta frequencies in rapid-eye-movement (REM) sleep and non-REM (NREM) sleep increased monotonically as a function of prior waking. The increase of power density in the theta frequencies contrasts with the reported decrease of theta activity as detected by period-amplitude analysis. Slow wave activity (power density, 0.25-4.0 Hz) in NREM sleep during the first 3 h of sleep did not deviate significantly from the homeostatic process S of the two-process model of sleep regulation. In contrast, visually scored slow wave sleep, stages 3 and 4, deviated from this prediction at some circadian phases. It is concluded that, in accordance with the two-process model of sleep regulation, slow wave activity in NREM sleep depends on prior waking and is not significantly influenced by circadian phase.
Original languageEnglish
Pages (from-to)430-440
Number of pages11
JournalSleep
Volume13
Issue number5
Publication statusPublished - Oct-1990

Keywords

  • CIRCADIAN RHYTHMS
  • ELECTROENCEPHALOGRAM
  • HOMEOSTASIS
  • SLOW WAVE SLEEP
  • SPECTRAL ANALYSIS
  • 2-PROCESS MODEL
  • PERIOD-AMPLITUDE ANALYSIS
  • EYE-MOVEMENT DENSITY
  • SPECTRAL-ANALYSIS
  • EXTENDED SLEEP
  • RAT ELECTROENCEPHALOGRAM
  • DELTA ACTIVITY
  • YOUNG-ADULTS
  • TIME COURSE
  • NAP SLEEP
  • HZ EEG

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