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The Effects of Electric Shock Stress on Rapid Eye Movement (REM) Sleep in Hooded Rats

The effects of various parameters of electric footshock on the sleep stage distribution of hooded rats were investigated in three experiments. Shock severity, rather than predictability or controllability, affected sleep stage distribution. Continued suppression of REM sleep occurred with the administration of 150, but not with the administration of 15 shocks per day. The predictability of shock onset and the controllability of shock offset, had no effect whatsoever on sleep stage distribution.