Buckeyes, around 11-12 weeks old now. There's poop on the roost so I know they go up there but so far they sleep at night bunched up near the door that I close every night.
I put my two up on the roost also, a few times and they got the idea.
I always have a roost in with the chickens from one day old on (miniature, sitting on the floor). They start using the roost while still in the brooder. They get used to roosting very early and transition easier when you move them to the coop. As they grow in the coop, the roost are made wider and higher depending on their jumping ability. I have an introduction pen inside the coop so hens and pullets can get used to each other. Then the introduction pen is then removed.
No I don't really care where they sleep. I just thought they'd be all over it since they showed a tendency to climb on things very early on. Once I was cleaning the metal dog crate they lived in for the first few weeks. A few of them within minutes of opening the door were trying really hard to perch up on the thin crate bars that were now exposed with the door opened.
Mine do as well, and I suspect heat. Our lows are in the low 80's lately.