I recently went through the same problem. Our 3 year old would come into our bed in the middle of the night which was getting very old for my husband and I. I did some research and found several different solutions. I know my daughter and rewards work really well for her. We made a bedtime routine and made a sleeping chart. If she slept in her own bed ALL NIGHT she got a sticker on her chart. At the end of the week she got to go to the store and get a pair of pajamas or whatever she picked out (under $10). We are going on our third week sleeping all night in her own bed. The sticker is a big enough reward for her but when she gets to pick out a gift at the store it is even better. She gets really excited. The article I got this idea from suggested making a 6 week chart. We are on our third week and we are now going to do every two weeks she gets a reward. The routine is working really well too. She knows that after we get pajamas on we brush our teeth and read two stories. I think she is sleepin better and wakes up better in the morning.