My DS is 5 months old and when I went into his room when he woke at 7am he got a bit excited and rolled from his front to his back but banged his head on the side of the cot. He drank a big bottle and played normally for about an hour (laughing, banging about toys etc) but he has now been sleeping for nearly an hour and a half when usually his morning nap is only about 30 minutes... should I be worried or AIBU and need someone to tell me to get a grip?? Please feel free to do so if necessary!