The strangers in your dreams are actually people that you've seen in real life.
50
Sea otters hold hands while sleeping so they don’t drift away from each other.
104
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 human brain is more active during sleep than during the day.
28
Termites work 24 hours per day and they do not sleep.
57