2 kids, 1 small bedroom.

We recently moved our 6.5 month old out of our bedroom. She was waking up 4- 5 times a night. My husband and I weren’t sleeping. We live in a small 2 bed, 1 bath apartment. The second bedroom has enough room for a bed and a dresser with room to walk between. We also have a few of my 4.5 year olds toys in there. A toy chest and a Barbie dream house. There’s barely any room for our youngest daughters crib and dresser. Even her pack n play barely fits! My oldest daughter dresser is crammed in the closet. And now there’s barely any space in there room. We have bunk beds already for my oldest. My thought was to get rails for the bottom bunk, ones that go the length of the bed, and use that for our 6.5 month old. So she can’t roll off. It’s basically like a crib right? Any other ideas? My husband had an idea of giving them our room, the bigger one, but only our bed would fit in the smaller bedroom, so that wouldn’t really work..