I blocked off the nest until mine started getting closer to laying age. They're creatures of habit so once they get into the habit of getting on the roost, they will just go straight there. I also put a golf ball inside and they seem to know it's a nesting site and not a place to sleep. The roost is also higher than the nest and is a 2x4 so it's comfortable for them.
You might also make sure you have a couple of roosts just in case some birds won't allow others to be on the same roost.
now my jap ko shamo, as its got really tall legs cant sleep on the sticks anymore. so it sleeps on the floor and sometimes at night gets pooed on. what shall i do because i want it to feel comfortable at night. btw its as tall as my waist ( im quite tall at 13)