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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.
Sometimes that takes two, three, or four sneezes. 1  Why Sneezing and Snoozing Don't Mix You may snore, but you don't sneeze when you sleep. 2  It has to do with sneezing being a reflex action. 3  When you're sleeping, the nerves involved in sneezing are relaxed, breaking the chain reaction of the typical sneeze. It has to do with sneezing being a reflex action. 2  When you're sleeping, the nerves involved in sneezing are relaxed, breaking the chain reaction of the typical sneeze. 3  If someone were to wave irritants under your nose while you were sleeping, however, you might wake up and sneeze.