Studies show that the colder the room you sleep in, the more likely you are to have a bad dream.
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Cows can sleep standing up, but they can only dream lying down.
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In China, teachers allow children to sleep in class for around 20 minutes to help improve their learning.
13
There's a love mattress that is specifically designed for couples who sleep on each other's arms.
12
One reason that kittens sleep so much is because a growth hormone is released only during sleep.
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"Dysania" is the state of finding it hard getting up out of bed in the morning.
33
Sea otters hold hands while sleeping so they don’t drift away from each other.
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