Cows can sleep standing up, but they can only dream lying down.
745
There's a love mattress that is specifically designed for couples who sleep on each other's arms.
12
If you hold farts in during the day, they'll just come out when you sleep.
16
You can reschedule your sleeping pattern by not eating 12-16 hours before you want to be awake. Upon eating after this time period, your internal clock will reset to a new day, with the time of your first meal being interpreted as "morning".
11
The record for the longest scientifically documented period without sleep is 264.4 hours (eleven days).
15
Sleeping on your stomach can induce weirder, scarier, and sexier dreams.
22