Hey mamas, we are about to graduate to a new sleeping arrangement and I need some tips. DD is 8.5 months old. So far she has been sleeping part of the night in the Arms Reach co-sleeper and part of the night actually in our bed. This has worked out really well and now that she has outgrown the co-sleeper (she can get up on her knees and bend over the sides, so it's no longer safe) we wanted to keep doing something similar. Someone in the neighborhood is giving us a crib mattress. We want to put our mattress and box spring on the ground and put the crib mattress on the floor next to our mattress.
I have two concerns - first of all, I'm not sure how to make sure the two mattresses stay together, so that DD does not fall in between. Second, I'm not sure what to do about her rolling off the mattress. It'll only be a few inches off the floor, so not a huge deal, but I imagine it would wake her up at the least! Should I put blankets or pillows all around the mattress? I guess I have a little bit of worry she'd roll off, end up all tangled up in them, and suffocate or something.
So, tell me how to make the mattress-on-the-floor option work!