Where do roosters sleep?
Roosters prefer to sleep off the ground in a protected area. If there is no coop available, they will roost in trees.
In the chicken coop with the hens. He will guard them from predators like weasels and rats (roosters are usually the first victim to bigger weasels) If all you have are roosters then they need safe shelter,away from winter drafts and rain. Roosters need (just like hens) a perch minimum about 2 ft. off the ground for sleeping.