I'm having this problem too!
DD doesn't fall out when she's asleep though. She climbs out when she's awake. . . .
Our set-up: Double bed against the wall, with the crib on the other side. Unfortunately, this leaves about 18 inches at the bottom on the non-wall side where she can climb out. If I sleep with her all night, it's not a problem, but if I leave to sleep with DH and she wakes up silently, she will climb out.
Unfortunately, putting the mattress on the floor is not an option unless we get rid of the bed (no place to store it). Last night, I put her in the crib, but that only lasted 45-60 minutes.
What I want is a double-bed with crib rails! Idealy, one half of one side would fold down completely, so mom/dad can climb in and out of the bed.
Does anyone know of bed rails that will cover the full length of a double bed (60 inches)????