We made a clean switch, let him shoose his own doona and sheets ect and got him excited about being a "BIG BOY" and explained that big boys sleep in BIg beds ect, and his new roon that he could help pick the decor ect. Had a couple of nights where we let him fall asleep on the lounge then moved him, and also put the COt matress on the floor in his room so he could sleep on that if he wanted to. Goodluck