ANIMAL GOODY SLEEP ?
Sleep in non-humans
Sleeping Japanese Macaques.Main article: Sleep (non-human)
Horses and other herbivorous ungulates can sleep while standing, but must necessarily lie down for REM sleep (which causes muscular atony) for short periods - giraffes, for example, only need to lie down for REM sleep for a few minutes at a time. Bats sleep while hanging upside down. Some aquatic mammals and some birds can sleep with one half of the brain, while the other half is awake, so called unihemispheric slow-wave sleep Birds and mammals have cycles of non-REM and REM sleep as described above for humans, though birds’ cycles are much shorter and they do not lose muscle tone (go limp) to the same extent that most mammals do.
Many animals sleep, but neurological sleep states are difficult to define in lower order animals. In these animals, sleep is defined using behavioral characteristics such as minimal movement, postures typical for the species and reduced responsiveness to external stimulation. It is quickly reversible, as opposed to hibernation or coma, and sleep deprivation is followed by longer and/or deeper sleep.
Many species of mammals sleep for a large proportion of each 24-hour period when they are very youngHowever, killer whales and some dolphins do not sleep during the first month after they are born
Longest period without sleep
GOOOOOOOOOOOOOOOOOOOOOOOOOOD LONG NIGHT
