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
Sleeping on the job is acceptable in Japan. It is viewed as exhaustion from working hard. Some people fake it to look committed to their job.
57
47% of people have a nightmare at least once a month.
186
Bats sleep 18-20 hours per day.
5
Sleeping on your stomach can induce weirder, scarier, and sexier dreams.
22
A new parent will lose about 1055.6 hours of sleep in the first year of their child's life - almost 44 days!
6
The human brain is more active during sleep than during the day.
28