You burn more calories sleeping than you do watching television.
348
The human brain is more active during sleep than during the day.
28
Bats sleep 18-20 hours per day.
5
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
You forget 90% of your dreams.
256
Quick naps not only improve your alertness, but they also help in decision making, creativity and sensory perception.
149