Sleeping on your stomach can induce weirder, scarier, and sexier dreams.
22
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
The average cat sleeps about 2/3 of the day.
203
The harder you concentrate on falling asleep, the less likely you are to fall asleep.
34
The record for the longest scientifically documented period without sleep is 264.4 hours (eleven days).
15
47% of people have a nightmare at least once a month.
186
One reason that kittens sleep so much is because a growth hormone is released only during sleep.
212
Blue light fends off drowsiness in the middle of the night, which could be useful to people who work at night.
240