my baby is 3yr old. During deep sleep she got jerks in hand and legs l. when wakeup, it got disappear and she was normal. jerks was happend during in night sleep only. some times she cries. when I ask this about pediatrion, he said this might be mayoclonus and no need to worry and suggested calcium syrup. I have a doubt that, how long jerks will continue and is this serious problem.