If you hold farts in during the day, they'll just come out when you sleep.
16
You forget 90% of your dreams.
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Sleeping on your stomach can induce weirder, scarier, and sexier dreams.
22
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
Those who get out of bed by 7am are more likely to be thinner and happier.
20
There's a love mattress that is specifically designed for couples who sleep on each other's arms.
12
In China, teachers allow children to sleep in class for around 20 minutes to help improve their learning.
13