Sea otters hold hands while sleeping so they don’t drift away from each other.
104
47% of people have a nightmare at least once a month.
186
A new baby usually deprives each of it's parents around 350-400 hours of sleep in the first year. That is one entire nights sleep per week, per parent.
194
Staying awake for 17 hours is the same for your body as drinking 2 glasses of wine.
193
Blue light fends off drowsiness in the middle of the night, which could be useful to people who work at night.
240
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
Bats sleep 18-20 hours per day.
5