Reindeer in the Arctic Reduce Sleep Need During Rumination

Timing and quantity of sleep depend on a circadian (∼24-h) rhythm and a specific sleep requirement. Sleep curtailment results in a homeostatic rebound of more and deeper sleep, the latter reflected in increased electroencephalographic (EEG) slow-wave activity (SWA) during non-rapid eye movement (NREM) sleep. Circadian rhythms...