I have put them up there a few times, but not at dark. Perches are about 2-3 ft off ground. I guess I will try putting them up there for a few days straight. Does it hurt anything for them to be on the ground?
Silkie chickens sleep on the ground. I have had a "silkie Pile" every night now for quite some time. It is amazing what chickens you see in the morning in the silkie pile. My big Ol' cochin roo always sleeps in the silkie pile. Other chickens visit it. Must be a comfort thing.
I found my old buff orp hen dead in the pile (natural causes). She never slept there. I guess she found comfort there in her last day.