How high is the rail?
I rolled over it on night. had a real nasty bruise for 2 weeks from hitting the chest of drawers on the way down. I was about 8-9 ??? at the time though. I roll, move and end up sometimes with my head at the bottom of the bed ... so I'm not the prime candidate for a bunk.
I do remember a temporary 1.5' high rail in the beginning and then went down to a small 6'' type. That is the one that got me
Oh yeah! Keep the teddy bear amount down from the wall side. lolo, that is what probably got me

Wayyyyyy toooo many!