My son is 2.5 and sleeps most nights just fine in his crib at home. Starting this past August, whenever we travel he refuses to sleep in a pack n play and will climb out. He will only sleep in a bed with someone, and will not go to sleep at his normal bedtime. We currently have a blow up mattress and toddler bed for him ready to go at my parents house. Any suggestions on how to transition either to the bed by himself or how to keep him in the pack n play?