Hello doctor why does my grandson keep waking up every 1 and half hour or 2? He takes time to fall asleep sometimes 40 minutes s rarely an hour usually 20 mins . Sometimes cries a lot inconsolable .He is now 1 yr 7 months old.. This was gapping since he was 6 months old. He naps for an hour once in the morning and 40 mins another time. sometimes only one nap. please advice.