Thank you for the replies. I actually think he's not too big for the pack n' play I think he just doesn't like it. He prefers a crib. I think he likes the security of a crib, with the slats and all, and it's higher off the ground too. I'm going to still try to get him to sleep in it the rest of the week. I thought about getting the side rails too for a regular bed, the thing is when we try to lay him down in a bed, in his mind it's play time! He'll stand up in the bed and try to walk around. I would be afraid to leave him alone in a regular bed. He loves to climb. I shouldn't be so surprised about all of this, I trained him to sleep in his crib when he was small. I guess I should have let him sleep in the pack n' play some, and not just when we went on trips.