Cows can sleep standing up, but they can only dream lying down.
745
Blue light fends off drowsiness in the middle of the night, which could be useful to people who work at night.
240
Bats sleep 18-20 hours per day.
5
The record for the longest scientifically documented period without sleep is 264.4 hours (eleven days).
15
Quick naps not only improve your alertness, but they also help in decision making, creativity and sensory perception.
149
If you hold farts in during the day, they'll just come out when you sleep.
16