Reading the forum about transitioning chicks to a coop from a brooder is like reading a forum discussion on getting children to sleep. There is the Farber method where you just put the chicks in the coop, turn off the light, let them squabble a bit, and then they settle down. For some of us, though, we anthropomorphize our babies and need to feel as though they feel safe. I saw all sorts of suggestions, from night lights, timers, solar powered lights that dim.
And who knew that a chicken can fall off the roost? Nightmare for me, indeed!
Baby Chicks doze off where ever they stand. Then settle down to sleeping on the ground
Anne at Echo Mountain View Road chickens