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Sleep. 2005 Nov;28(11):1446-54.

Homeostatic sleep regulation in adolescents.

Author information

1
E P Bradley Hospital Chronobiology and Sleep Research Laboratory, Department of Psychiatry and Human Behavior, Brown Medical School, Providence, RI, USA. Oskar.Jenni@kispi.unizh.ch

Abstract

STUDY OBJECTIVES:

To examine the effects of total sleep deprivation on adolescent sleep and the sleep electroencephalogram (EEG) and to study aspects of sleep homeostasis.

DESIGN:

Subjects were studied during baseline and recovery sleep after 36 hours of wakefulness.

SETTING:

Four-bed sleep research laboratory.

PARTICIPANTS:

Seven prepubertal or early pubertal children (pubertal stage Tanner 1 or 2 = Tanner 1/2; mean age 11.9 years, SD +/- 0.8, 2 boys) and 6 mature adolescents (Tanner 5; 14.2 years, +/- 1.4, 2 boys).

INTERVENTIONS:

Thirty-six hours of sleep deprivation.

MEASUREMENTS:

All-night polysomnography was performed. EEG power spectra (C3/A2) were calculated using a Fast Fourier transform routine.

RESULTS:

In both groups, sleep latency was shorter, sleep efficiency was higher, non-rapid eye movement (NREM) sleep stage 4 was increased, and waking after sleep onset was reduced in recovery relative to baseline sleep. Spectral power of the NREM sleep EEG was enhanced after sleep deprivation in the low-frequency range (1.6-3.6 Hz in Tanner 1/2; 0.8-6.0 Hz in Tanner 5) and reduced in the sigma range (11-15 Hz). Sleep deprivation resulted in a stronger increase of slow-wave activity (EEG power 0.6-4.6 Hz, marker for sleep homeostatic pressure) in Tanner 5 (39% above baseline) than in Tanner 1/2 adolescents (18% above baseline). Sleep homeostasis was modeled according to the two-process model of sleep regulation. The build-up of homeostatic sleep pressure during wakefulness was slower in Tanner 5 adolescents (time constant of exponential saturating function 15.4 +/- 2.5 hours) compared with Tanner 1/2 children (8.9 +/- 1.2 hours). In contrast, the decline of the homeostatic process was similar in both groups.

CONCLUSION:

Maturational changes of homeostatic sleep regulation are permissive of the sleep phase delay in the course of adolescence.

Comment in

PMID:
16335485
[Indexed for MEDLINE]

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