There's a love mattress that is specifically designed for couples who sleep on each other's arms.
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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
In China, teachers allow children to sleep in class for around 20 minutes to help improve their learning.
13
Cows can sleep standing up, but they can only dream lying down.
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The higher someone’s I.Q. the more likely they are to be sleep deprived.
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A new parent will lose about 1055.6 hours of sleep in the first year of their child's life - almost 44 days!
6
Sea otters hold hands while sleeping so they don’t drift away from each other.
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