Sleep is important for Homeostasis. In this experiment, small decreases in temperature were noted by day 2 after a single night of deprivation, showing that sleep deprivation disrupts the regulation of body heat. Meney, I., Waterhouse, J., Atkinson, G., Reilly, T., Davenne, D. (1998). The Effect of OneNights Sleep Deprivation on Temperature, Mood, and Physical Performance in Subjects with Different Amounts of Habitual Physical Activity. Chronobiology International, 15(4), 349–363.