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Imagine that you're relaxed and drifting off to sleep when suddenly an arm or leg twitches and you have the sensation of falling out of bed. If this has happened to you, you've experienced what sleep specialists call a hypnic jerk or sleep start. Sleep starts happen in normal, healthy people and don't ordinarily require any medical treatment. However, certain medical conditions can make you jump in your sleep and should be evaluated by your physician.
SP - Sleep Paralysis - A natural, safe part of the process of falling asleep which causes you to be unable to move your body. The paralysis process happens to you every time you go to sleep. When you WILD and experience SP, you are conscious while it happens.