![]() Assuming that, say, roaming around at night is more dangerous that staying with the rest of the pack in a safe place, then sleep would evolve for no reason other than to force itself upon the individual to induce a safer behaviour. So the author concludes that no, sleep is not universal moreover given the great variation in sleeping time and behaviours, sleep may be serving different functions in each species.įrom the same year however, Cirelli & Tononi assess the hypothesis that sleep may just be a default state when all the needs have been met. A few species are also able to sleep one hemisphere of the brain at a time, even when in flight
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