DS will be 3 in September and we transitioned him to a toddler bed about three weeks ago. The first two weeks went great, but for the last week, he refuses to stay in his bed at bedtime. Just keeps coming out of his room. He tries the "I have to go pee pee" excuse a few times, and then he just starts coming out for no reason. We're going on an hour and a half here tonight. And he's exhausted - dark circles under his eyes, meltdowns, etc.

How do you get your toddler to stay in their bed?