Sea otters hold hands while sleeping so they don’t drift away from each other.
104
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
The harder you concentrate on falling asleep, the less likely you are to fall asleep.
34
The higher someone’s I.Q. the more likely they are to be sleep deprived.
29
You forget 90% of your dreams.
256
If you hold farts in during the day, they'll just come out when you sleep.
16
Blue light fends off drowsiness in the middle of the night, which could be useful to people who work at night.
240