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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.
1. 0. Wake up at 3 means you have some problem that you don,t have a proper sleep, either you are facing sleep apnea or some stomach problem, just keep in mind that never sleep immediately after a meal, eat a meal 3-4 hours before sleeping and take a walk before sleeping by that you have a nice and good night sleep.. Well if you want to know that what does it mean when you wake up breathless then let me tell you that it means you feel as you can not breath properly when you wake up actually this is a disease so you better go get a check up.