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 average person falls asleep in seven minutes.
115
Sleeping on your stomach can induce weirder, scarier, and sexier dreams.
22
Blue light fends off drowsiness in the middle of the night, which could be useful to people who work at night.
240
47% of people have a nightmare at least once a month.
186
Honeybees never sleep.
276
Studies show that the colder the room you sleep in, the more likely you are to have a bad dream.
28