These four non-REM stages described above take you approximately one hour into your first sleep cycle. You will then re-emerge towards consciousness and experience a brief awakening that you won't remember; this is often when you turn over or grab back some of the sheets. After this you start REM sleep, where high-frequency waves begin to appear on the EEG screen. Your brain has now started to create some alpha and beta waves, which are similar to the ones produced when we are awake. You are probably dreaming and your eyeballs are moving under their lids, which is what gives REM sleep its name (you can also dream in non-REM sleep, but these dreams tend to be simple and short). Although dreams seem very real and physically active, your body won't act out your dreams as your muscles are paralyzed in this stage and you remain motionless (some scientists believe that this is the body's way of preventing you from harming yourself). Sleepwalking is likely to happen in the non-REM part of your sleep, which isn't accompanied by paralysis.

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