The human brain is more active during sleep than during the day.
28
The record for the longest scientifically documented period without sleep is 264.4 hours (eleven days).
15
The average cat sleeps about 2/3 of the day.
203
The higher someone’s I.Q. the more likely they are to be sleep deprived.
29
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
You burn more calories sleeping than you do watching television.
348
Quick naps not only improve your alertness, but they also help in decision making, creativity and sensory perception.
149
Honeybees never sleep.
276