Studies show that the colder the room you sleep in, the more likely you are to have a bad dream.
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The average cat sleeps about 2/3 of the day.
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There's a love mattress that is specifically designed for couples who sleep on each other's arms.
12
The record for the longest scientifically documented period without sleep is 264.4 hours (eleven days).
15
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
You burn more calories sleeping than you do watching television.
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