Hi mommies. My baby is 3.5 months old. Recently I have noticed a change in his sleeping pattern. He starts with light sleep then goes into deep sleep then light sleep where he moves so much that I feel that he is on the verge of getting up but to my utter surprise he again goes into deep sleep and the pattern continues for 5hrs when he finally gets up. What is this movement all about? Is something bothering him or is it normal?