Studies show that the colder the room you sleep in, the more likely you are to have a bad dream.
28
The average cat sleeps about 2/3 of the day.
203
Blue light fends off drowsiness in the middle of the night, which could be useful to people who work at night.
240
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
In China, teachers allow children to sleep in class for around 20 minutes to help improve their learning.
13
Bats sleep 18-20 hours per day.
5
You burn more calories sleeping than you do watching television.
348