Oskar was 2 1/2 when he went from the cot, in our room next to my side of the bed to.... his own room and new bed all in one night! HE decided to do it. The bed was in his room for ages but he wouldn't even have a day sleep on it. Then we moved his room around cos he got a train table for his birthday so I needed to move things to fit it in nicely. He got new sheets on the bed and after about a week I think, he just decided to sleep in there and that was that, he's been there ever since.