Riley sleeps with my mom and TJ sleeps with me. Riley has never had an accident on the bed or fallen off or been rolled over on. TJ has had two accidents on my bed, but I have a mattress protector on my bed for him. He lays up against the wall and I lay next to him. I can't really roll over on him and he can't fall off because he's scoots as close as possible to the wall.
