Bats sleep 18-20 hours per day.
5
47% of people have a nightmare at least once a month.
186
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
The human brain is more active during sleep than during the day.
28
A new parent will lose about 1055.6 hours of sleep in the first year of their child's life - almost 44 days!
6
Blue light fends off drowsiness in the middle of the night, which could be useful to people who work at night.
240
Studies show that the colder the room you sleep in, the more likely you are to have a bad dream.
28
Lack of water is the #1 trigger of daytime fatigue.
148