Keith Richards heard the riff to "(I Can't Get No) Satisfaction" in a dream. He woke up, played the riff on a tape recorder and mumbled "I can't get no satisfaction" and went back to sleep.
Studies show that the colder the room you sleep in, the more likely you are to have a bad dream.
Sleeping on your stomach can induce weirder, scarier, and sexier dreams.
Paul McCartney dreamed the melody of "Yesterday" one night and immediately wrote the music the next morning. He then looked around for a month to make sure that he didn't subconsciously plagiarize it from somebody else.
The strangers in your dreams are actually people that you've seen in real life.
You forget 90% of your dreams.
Cows can sleep standing up, but they can only dream lying down.
47% of people have a nightmare at least once a month.