A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
47% of people have a nightmare at least once a month.
186
Bats sleep 18-20 hours per day.
5
You can reschedule your sleeping pattern by not eating 12-16 hours before you want to be awake. Upon eating after this time period, your internal clock will reset to a new day, with the time of your first meal being interpreted as "morning".
11
There's a love mattress that is specifically designed for couples who sleep on each other's arms.
12
The average cat sleeps about 2/3 of the day.
203