Pool Noodle in Bed

My husband found this post about traveling with kids, suggesting to bring a pool noodle along to slip under the sheet at the edge of the bed to give kids a reminder not to roll off the bed. My 3 year-old is sleeping in his old converted crib. It has three walls and is open on the front. Like his brother, he likes to sleep on the edges of the bed; so, we bought one of those bedrails that slips under the mattress, but only extends partway down the bed, giving him a spot to climb into bed from. He prefers to sleep with entire body on the pillow across the width of the bed - but lately, he's gotten too long to do that. This meant his head was getting shoved into the net portion of the bedrail, making him look like a fish caught in a net. I've coaxed him into lying lengthwise now. Yesterday I removed the rail and slipped in a pool noodle we bought. After a nap and a full night in bed, it seems to be working.