Bats sleep 18-20 hours per day.
5
The harder you concentrate on falling asleep, the less likely you are to fall asleep.
34
Quick naps not only improve your alertness, but they also help in decision making, creativity and sensory perception.
149
The human brain is more active during sleep than during the day.
28
Honeybees never sleep.
276
Blue light fends off drowsiness in the middle of the night, which could be useful to people who work at night.
240
"Dysania" is the state of finding it hard getting up out of bed in the morning.
33