I have seen that the reward system has not worked for you in the past. Is there any chance you haven't used rewards that are immediate and valued by your child? My nearly 5 yo son got out of bed all the time around 3 yo, and we were at our wits' end, especially with a new baby up a lot as well. That's when we implemented our own version of Marc Weisbluth's (Healthy Sleep Habits, Happy Child) reward system. For Calvin, if he goes to bed without getting up, and stays in bed all night, we give him a treat the next day. We remind him all day about following the sleep rules when we get in a bad rut. And we make sure he knows why he's not getting a treat when we have to withhold it. The treat can be anything from a couple M&Ms, a cookie, birthday cake, whatever - and yes, I have on occasion kept him from having cake at a party, but only when things are really bad! You have to know that I am a very healthy person and the rest of his diet is very nutritional, but I am fine with the treat because his sleep was so rotten!