The human brain is more active during sleep than during the day.
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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
One reason that kittens sleep so much is because a growth hormone is released only during sleep.
212
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
Sea otters hold hands while sleeping so they don’t drift away from each other.
104