A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
Sea otters hold hands while sleeping so they don’t drift away from each other.
104
"Dysania" is the state of finding it hard getting up out of bed in the morning.
33
The higher someone’s I.Q. the more likely they are to be sleep deprived.
29
Studies show that the colder the room you sleep in, the more likely you are to have a bad dream.
28
The average cat sleeps about 2/3 of the day.
203