T is 3 in a month and dropped his nap last month. Previously he would nap every few days for a few hours and usually would sleep 11 hours at night. Now he is not napping and is only sleeping 10 hours most nights. Sometimes 10.5. Last night 9.5. I have no idea what is up. He used to sleep 8-7 or 830-730 and now it's 8-6 or 830-630. Earlier bed time just means earlier waking for him usually.

Did this happen to anyone else?