Sleep behavior following chronic sleep restriction. Averaged percent time asleep, after 11 weeks of recovery sleep (17 weeks of age), showed a statistically significant main effect of sex and phase, and a significant interaction between Sex × Phase. There was a trend toward an effect of condition (p=0.093), in which sleep-restricted mice showed increased time sleeping compared to control mice. Bars represent the means ± SEMs in 9 control male, 11 sleep-restricted male, 14 control female, and 11 sleep-restricted female mice.