My son who is 3years and 7 months old,when he sleeps a tingling sensation started in his body, like fingers,shoulder,legs,knee,neck means all body shows slightly sansation.Only its one body part tingle at one time and its last for 2-3 sec. then other body part starts the same n its continous during his whole sleep.He is completly healthy n active child there is no other problem to him.This problem had started when he was 2.5 years old at that time he suffered from high fever n vomating..I m very worry about him,what should i do?