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
There's a love mattress that is specifically designed for couples who sleep on each other's arms.
12
Staying awake for 17 hours is the same for your body as drinking 2 glasses of wine.
193
The human brain is more active during sleep than during the day.
28
If you hold farts in during the day, they'll just come out when you sleep.
16