Cows can sleep standing up, but they can only dream lying down.
745
Honeybees never sleep.
276
Bats sleep 18-20 hours per day.
5
47% of people have a nightmare at least once a month.
186
Termites work 24 hours per day and they do not sleep.
57
Some people have a "natural alarm clock" allowing them to wake up when they want. This is actually caused by a burst of the stress hormone adrenocorticotropin.
15
You burn more calories sleeping than you do watching television.
348