Hi, A.. Do your kids actually go to sleep at 7:30? Or do they just stay in their rooms starting at 7:30? My kids don't go to bed until 9, so I am amazed that you can get your kids to sleep that early. Does your 3 year old nap during the day? If he does, I would honestly say he is probably not tired at 7:30. If you cut out the nap, he might do better. If he doesn't nap, then maybe making the rule that he can't come out of his room is all you can do. Keep the lights low or off with a night light if he doesn't like the dark, and keep putting him back in like you have been doing until he gets tired of trying. My daughter is 3 also, and she does take a nap each day. She has been trying us in the evening too with coming out of her room over and over again. I do take things away, like computer time, when she comes out over and over, but I also reward her when she stays in her bed. It is frustrating, I know. If he wants you near him, see if you stay outside his room within earshot for 10 minutes, and that helps. He may be going through a separation phase. He most likely just may not require as much sleep as your other boys. Try adjusting wake up times, nap times, and bed times if necessary. Good Luck!