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
Honeybees never sleep.
276
Dieters who sleep more take off more fat that those who sleep less.
159
47% of people have a nightmare at least once a month.
186
"Dysania" is the state of finding it hard getting up out of bed in the morning.
33