Abstract: Male albino rats were deprived of sleep for 24,48 and 96 hrs on a smallplatform (d=4.5cm) surrounded by water. Thresholds for electroconvulsiveshock decreased significantly jn sleep-deprived rats. Controlled animals wereplaced on a large platform (d=11.5cm) surrounded by water for 20 hrs andwere returned to a normal rearing cage for 4 hrs. The threshold forelectroconvulsive shock increased slightly in the controlled ones. Resultsindicated that sleep deprivation heightened the excitability of central nervoussystem.

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