A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
Staying awake for 17 hours is the same for your body as drinking 2 glasses of wine.
193
The harder you concentrate on falling asleep, the less likely you are to fall asleep.
34
Cows can sleep standing up, but they can only dream lying down.
745
You forget 90% of your dreams.
256
47% of people have a nightmare at least once a month.
186
Blue light fends off drowsiness in the middle of the night, which could be useful to people who work at night.
240
Dieters who sleep more take off more fat that those who sleep less.
159