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Am J Physiol Regul Integr Comp Physiol 280: R1606-R1612, 2001;
0363-6119/01 $5.00
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Vol. 280, Issue 6, R1606-R1612, June 2001

Enhancement of REM sleep during extraocular light exposure in humans

Patricia J. Murphy and Scott S. Campbell

Laboratory of Human Chronobiology, Department of Psychiatry, Weill Medical College of Cornell University, White Plains, New York 10605

This study examined the effects on sleep of light administered to an extraocular site. A 3-h photic stimulus was applied to the popliteal region during sleep in 14 human subjects. Each subject also underwent a control stimulus condition during a separate laboratory session. The proportion of rapid eye movement (REM) sleep during the 3-h light administration session increased by an average of 31% relative to the control condition. The frequency but not the duration of REM episodes was altered during light exposure, thereby shortening the REM/non-REM (NREM) cycle length. No other sleep stages were significantly affected during light administration nor was sleep architecture altered after the light-exposure interval. These results confirm that extraocular light is transduced into a signal that is received and processed by the human central nervous system. In addition, they expand to a novel sensory modality previous findings that REM sleep can be enhanced by sensory stimulation.

bright light; sensory stimulation; rapid eye movement sleep enhancement


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