47% of people have a nightmare at least once a month.
186
"Dysania" is the state of finding it hard getting up out of bed in the morning.
33
Bats sleep 18-20 hours per day.
5
The average cat sleeps about 2/3 of the day.
203
The human brain is more active during sleep than during the day.
28
Cows can sleep standing up, but they can only dream lying down.
745