Average ± SEM of A) wake bout duration in minutes, B) number of wake bouts, C) total minutes of wake, D) NREM bout duration in minutes, E) number of NREM bouts, F) total minutes of NREM, G) REM bout duration in minutes, H) number of REM bouts and I) total minutes of REM during the lights on period in BiP wild-type and BiP HET mice at 3 ages. Statistically significant differences are indicated by * (p<0.05), ** (p<0.01) and *** (p<0.001).