B.A.
I went through this with my son when he was about 16 maybe 18 months old. He also used to just get his "goodnights" from Mommy and Daddy and I'd lie him in bed and out he'd go. Then one night he literally jumped OUT of his crib and was at his bedroom door before I even closed it. It was almost as if something scared him but there was nothing to scare him. Never figured it out and we spent a few months waiting for him to fall asleep on the floor and finally, we ended up getting rid of the crib and getting small toddler bed. It helped and we even let him help us arrange his room, bought a brand new cool nightlight that he picked out and made sure he had some "cuddlies" to sleep with. It took a while a ton of patience but he finally started sleeping in his room again.