There's a load of stuff our bodies are secretly doing while we're asleep, but there's also a fairly weird list of stuff that we're fully aware of happening - like that annoying twitch in your eye when you're really tired, or the way your body violenty jumps just as you're drifting off.
A team of scientists explained to the Daily Mail exactly why this happens to us.
Our eyes are so sensitive to this because the muscles around them are so sensitive, but the condition is actually harmless (and known as eyelid myokmia).
Basically, to avoid it happening to you you need to make sure you're getting enough sleep and aren't over-tired. If you're developing deeper spasms in your face, consult with a doctor.
Professor Gaby Badre, a sleep expert at The London Clinic, explains that you will experience the vivid images and dreams, but because your muscles aren't fully relaxed, you twitch and jerk as if you were moving.
"People get worried about this, but it's perfectly normal," says Professor Badre. "The best thing to do is try to adopt a regular sleep pattern."
So basically, everything weird happens to you because you're so effing tired in the first place, so make sure you get more sleep *finger wagging*.
Read the full article on the Mail Online.