The average person falls asleep in seven minutes.
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In China, teachers allow children to sleep in class for around 20 minutes to help improve their learning.
13
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
Studies show that the colder the room you sleep in, the more likely you are to have a bad dream.
28
People who sleep late have more mental stamina and can outperform early risers.
33