AJP - Regulatory, Integrative and Comparative Physiology, Vol 272, Issue 6 1792-R1799, Copyright © 1997 by American Physiological Society

ARTICLES

Development of REM and slow wave sleep in the rat

M. G. Frank and H. C. Heller
Department of Physiology, University of California San Francisco 94143-0444, USA.

Active sleep (AS) in the neonate has been considered to be an immature form of rapid eye movement (REM) sleep. Quiet sleep (QS) has been thought to represent an immature form of slow wave sleep (SWS). To determine the relationship between the behaviorally determined states of AS and QS and electrographically determined REM sleep and SWS, we examined sleep ontogeny in the developing rat using an experimental routine that permitted long-term recordings and minimized the effects of maternal separation. Under these conditions, a transient state that included electroencephalographic slow wave activity and phasic motor activity was eventually replaced with the mature SWS pattern. Our work suggests that neonatal QS is not an immature form of SWS and that AS is best considered as an undifferentiated behavioral state from which both SWS and REM sleep develop.

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