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Effects of Chronic Stress on Sleep in Rats

机译:慢性应激对大鼠睡眠的影响

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We measured sleep in rats during chronic stress using telemetry; four-channel EEGwas collected 24 hours/day in rats during 2 prestress days, days 1, 2, 3, 7, and 14 during chronic stress and 3 poststress days. States of REM sleep, non-REM (NREM) sleep and waking were scored for each 15-sec period of the EEG recordings. During the prestress period, rats slept (REM plus NREM) 55% of available time during the light hours and 34% of the dark hours with the remainder represented by waking. On the first day of stress, total sleep and, especially REM sleep, decreased markedly. By the second day of stress, only REM sleep in the controllable-stress group (but not the uncontrollable-stress group) was still significantly decreased as compared to prestress levels and REM sleep returned to baseline levels by day 7 of stress. The recovery of sleep quantity was accomplished by increased sleep during the dark hours, resulting in a long-lasting disruption of normal circadian sleep patterning.

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