Sep 5, 2024, 11:06 PM IST
Dolphins practice unihemispheric slow-wave sleep (USWS), where one half of their brain sleeps while the other half stays alert.
Elephants sleep for just 4 hours a day, usually lying down. They also take short naps during the day while standing.
Koalas sleep up to 20 hours a day, mostly in the treetops. Their sleep is essential for digesting their low-energy diet.
Giraffes sleep only about 4.6 hours a day, often in short bursts. They usually sleep while lying down but can also rest while standing.
Bats sleep upside down, hanging by their feet. They can sleep for up to 20 hours a day in their roosts.
Hummingbirds enter a state of torpor, a deep sleep-like state, to conserve energy at night, slowing their metabolism dramatically.
Platypuses sleep for about 14 hours a day. They have a unique way of sleeping while floating in water or on land.
Numbats are very active during the day but sleep for up to 18 hours each night. They often rest in burrows or hollows.
Opossums are known to sleep up to 18 hours a day, usually curled up in a nest or den, and they are nocturnal.