Sea otters hold hands while sleeping so they don’t drift away from each other.
104
Cows can sleep standing up, but they can only dream lying down.
745
The human brain is more active during sleep than during the day.
28
Lack of water is the #1 trigger of daytime fatigue.
148
Honeybees never sleep.
276
Termites work 24 hours per day and they do not sleep.
57
The harder you concentrate on falling asleep, the less likely you are to fall asleep.
34