This study was designed to record some physiological responses to research relationship between skin temperature, heat discharge and behavioral thermoregulation during sleeps. Changes in skin temperature, heat discharge and behavioral thermoregulation were recorded for 7 hours from 0:00 to 7:00. Changes in skin temperature and heat discharge show that during 0:00~1:30, they rise as time passes in all experimental conditions. One side, average behavioral thermoregulation occurs during 0:00~1:30 more than that of during 0:00~7:00. When average heat discharge during 0:00~1:30 was less than that of during 0:00~7:00,average behavioral thermoregulation during 0:00~1:30 occurs more than that of during 0:00~7:00. Results shows that the less the body loses its heat during 0:00~1:30, the more behavioral thermoregulation occurs.