Sea otters hold hands while sleeping so they don’t drift away from each other.
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47% of people have a nightmare at least once a month.
186
There's a love mattress that is specifically designed for couples who sleep on each other's arms.
12
Bats sleep 18-20 hours per day.
5
The average person falls asleep in seven minutes.
115
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23