Last week I converted Camden's crib to a toddler bed. I did it while he was napping (in another room). When we went in his room to change clothes, he noticed it right away. He had fun climbing in and out.
The first night he tossed and turned for the first hour, but stayed in the bed. He knew something was different and my guess is he felt less secure. The next morning he climbed out while still holding to the edege, grabed a toy in arm's reach each time, then climbed back in and threw it out. He repeated this several times. The next night and ever since he has gone to sleep just fine. Even if he fights sleep, he doesn't climb out at night. It was almost a week before he was adventorous enough to climb out of the bed in the morning and walk away. I guess he thought he'd be in trouble if he left the bed? Now it's been about a week and a half and he's doing just fine with the adjustment. Now he has more freedom and access to his toys in the morning. Yay for my big boy!