Researchers are intrigued. Do they sleep like people? Do they switch off the brain or keep a hemisphere awake? Although without definitive answers, they believe that most animals need to sleep , and they do it standing up, lying down, or on alert to avoid predators … They suspect that almost all species, and especially mammals, have a phase light sleeper -REM- and a deeper one. The first occupies 20% of the time and the second, 80%.
Mouse: 20.1 hours
Lazy: 20 hours
Possum: 19.4 hours
Shrew: 16 hours
Squirrel: 14 hours
Cat: 13.2 hours
Leon: 13 hours
Paloma: 11.9 hours
Dolphin: 10 hours
Chimpanzee: 10.8 hours
Dog: 10.7 hours
Vinegar fly: 10 hours
Male: 8 hours
Pork: 8.4 hours
Seal: 6 hours
Asian elephant: 5.3 hours
Cow: 5 hours
Sheep: 4 hours
Horse: 2.9 hours
