Rem Sleep and Ambient Temperature in Man

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Abstract
Five young adult males slept 2 consecutive nights under each of the 5 ambient temperatures chosen within the usual range: 13.degree. C, 16.degree. C, 19.degree. C, 22.degree. C and 25.degree. C. Bedding and other ambient parameters were kept constant under all 5 ambient temperature conditions. The average REM [rapid eye movement] cycle length significantly decreased when the ambient temperature increased from 13.degree. to 25.degree. C. Other REM sleep characteristics such as total duration of REM sleep, average REM period and REM sleep latency did not significantly differ from 1 ambient temperature condition to another.