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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.
your terror grows but then as suddenly as it began the pressure releases and the presence in the room fades into nothingness you can now move rise from the bed and try to make sense of what just happened to you you have just had an episode of sleep paralysis normally when you dream you are paralyzed this is handy because without this you would regularly act out your dreams in sleep paralysis however the normal cycles of your sleep become out of sync your mind wakes up but your body is still in a dream state you are aware of your surroundings but cannot move and may also experience any number of hallucinations