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In order to study effects of daytime activities on sleep, eleven healthy male university students (aged 19-25) spent three different activities days; the mentally and physically relaxation day, the mental active day, and the physical active day. Their sleep were recorded in the nights after these three different days. The large amount of slow wave sleep (SWS) concentrated on the first sleep cycle in the night after the physically active day. The individual differences in body temperature curve during a night became large in the order of the night after the physical active day, the night after the mental active day, and the night after the mentally and physically relaxation day. These results suggest that an active day not only leads to a good quality of sleep, but also stabilizes the circadian body temperature curve.