47% of people have a nightmare at least once a month.
186
Bats sleep 18-20 hours per day.
5
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
You forget 90% of your dreams.
256
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
Lack of water is the #1 trigger of daytime fatigue.
148