Sleeping on your stomach can induce weirder, scarier, and sexier dreams.
22
Dieters who sleep more take off more fat that those who sleep less.
159
Bats sleep 18-20 hours per day.
5
You burn more calories sleeping than you do watching television.
348
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
Blue light fends off drowsiness in the middle of the night, which could be useful to people who work at night.
240
"Dysania" is the state of finding it hard getting up out of bed in the morning.
33