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
Blue light fends off drowsiness in the middle of the night, which could be useful to people who work at night.
240
A new parent will lose about 1055.6 hours of sleep in the first year of their child's life - almost 44 days!
6
Quick naps not only improve your alertness, but they also help in decision making, creativity and sensory perception.
149
Sleeping on your stomach can induce weirder, scarier, and sexier dreams.
22
Sea otters hold hands while sleeping so they don’t drift away from each other.
104