Take them out of the nests and put them on the roost, well after dark, often only takes a few nights of that for them to get the idea.
Yes, although at the moment, I'll probably just put up with it, because it's the middle of winter (EDIT, there are stairs up to the coop, harder to negotiate when all rugged up). When it warms up a bit, the girls will be fully grown and may have sorted it out themselves. I don't know whether the little girls got up there and the girl who was on "their" perch bullied them off, or what.
I have a permanent hinged cover for my nest bank, flip it down
I put one in the other house, when the girls were sleeping in there. Several girls spend all day in there (or always seem to be in there when I look).
In the big girls' house, I got 2 nest boxes with "rollaway" inserts. They wouldn't use them, and started laying on the floor, so then I moved it around so it was in the "floor spot" and they started using it. And then the little girls started using it as a bedroom. sigh. It's never ending

.
Eventually, I'd like to cut into the side of the coop and install a flap/door, so I can get eggs without climbing up there, in the shorter term I'm going to put some of the original boxes back in. I don't know whether I'll persist with the "rollaway" box or sell it on.
I just wish they'd sleep where I want. They sleep up on top of the nest box, they sleep on top of the plastic bins I've got in there with food and bedding.... Most of them sleep on the perch like good girls, it may just be "bossy girl" (and now the new girls) who is sleeping elsewhere. When the new girls get bigger/more assertive, hopefully everyone will find her spot...