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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.
How can our body keep breathing while we are sleeping, when our brain is in sleep mode, and so are all our muscles? I woke up this morning and that question suddenly popped up in my head, and it has been bugging me all day lol. When we are asleep, our brain is disconnected, and our muscles are totally relaxed and in sleep mode too. That is how our body recovers and gets ready to get going again the following day.