A team of researchers from the University of Liege and the University of Surrey have scanned the brains of 33 participants across such a 2-day sleep deprivation period and following recovery sleep. Several brain regions followed a 24-hour rhythmic (circadian) pattern, but the patterns differed across regions. By contrast, other brain regions, especially the frontal brain areas, showed reduced brain activity with time awake and a return to sleep-deprivation levels after sleep. By the way, your brain’s frontal lobes are involved in motor function, problem solving, spontaneity, memory, language, initiation, judgment, impulse control, and social and sexual behavior. Best to get your Zzzzzzzzzs.