I had no idea how much they rolled around in the cribs in their sleep. They must have been like pinballs. Sam just rolled off the foot of his bed, and stayed asleep. While I was in their room, resetting him (!), Abby almost fell of the side of her bed. She self-stabilized, but when I went in earlier, both Sam and Ellie were off their mattresses.
Maybe we should pad the whole floor...?