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
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
44% of kids watch television before they go to sleep.
106
Cows can sleep standing up, but they can only dream lying down.
745
The human brain is more active during sleep than during the day.
28