Why DO people sleepwalk?
It's an interesting question because it happens mainly in young children and can be passed down by your parents but we still don't know exactly why it happens.
People get stuck right between awake and dead asleep and so their brain makes them do normal things, but their consciousness isn't really there.
We learned that instead of waking up a sleepwalker, it's best to try and direct them back to bed.
Don't worry, they won't die if you accidentally wake them.
Check out the video (above) to hear a doctor do his best to describe what sleepwalking actually is.