i have a number of silkies in different coops. About 50% of them like to sleep in nest boxes. As the others have mentioned, using pine shavings absorbs moisture and keeps them cleaner longer. Some of mine will roost, as they only need to hop a short distance to the roost, about 6". They hop on top of the nest boxes in that coop, then up onto the roost. In another coop i have a ramp and a plank. Especially during warm weather, most of the silkies sleep on that at night. In one coop i have a couple of silkies with huge crests. i'm lucky they can traverse the couple inch step up into their coop. They could never manage a ramp or multiple steps or making it onto a roost. So i guess what i'm saying is that you have to see what your silkies can handle and adjust your coop to fit their needs.