From the first night we moved in my son wanted to sleep in a big boy bed. I'm probably jinxing it but, we have not had any problems. He goes down for naps and bed, with no problem, he never gets out once we finish books. He hasn't gotten up and wandered around in the middle of the night, (which is what I was afraid of, he does that at other people's house when we stay over, it makes for long nights.) He in fact never gets out of bed, until we come in his room, he just stays in his room sucking his thumb with his blanket. Once we open the door he throws his blanket on the pillow and doesn't touch it until after book read the next time. He is being such a champ. This is how I find him most mornings, minus the blinds pulled up.
This is my son's room for now. I am in the process of making curtains so he doesn't break the blinds, because he is well on his way, as he looks outside at the diggers and trucks in our backyard.