Honeybees never sleep.
276
Lack of water is the #1 trigger of daytime fatigue.
148
The human brain is more active during sleep than during the day.
28
47% of people have a nightmare at least once a month.
186
One reason that kittens sleep so much is because a growth hormone is released only during sleep.
212
Cows can sleep standing up, but they can only dream lying down.
745