I have no advice im afraid but I just wanted to let you know that we are going through this at the moment also. He is a fantastic night sleeper (8:30/9:00pm - 7:00am) but he will only sleep during the day for 1/2 hour - 1 hour Before this he was sleeping 2 or 3 hours at a time! He goes through cycles of change all the time so I am hoping this is just a phase for him.