My baby hates to go down for a nap. The only way he'll do it is if we feed him and he gets sleepy. But, he only gets sleepy twice a day. He's 3 1/2 months old! He should be taking naps every hour and a half! He gets really fussy at night, but he doesn't want to go to bed then either. Then, when he wakes up, it's like, 4:30 am and he is up for the day. Needless to say, I am not, and neither is my wife. I wish he would sleep later, but I can't figure out how to get him back to sleep. A...