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Sleep is a weird idea, and sleepwalking is hardly understood by most of us.
If you know someone that sleepwalks, you undoubtedly have a ton of questions, such as: Should I wake them up? Can they hurt themselves? Can they hurt me?
Somnambulism, as it is called in the medical world, is actually a fairly common disorder. We've compiled a list of what scientists know about sleepwalking. Take a look.