The reason for doing it once it's completely dark is because they're less likely to jump off if they can't see.
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Is it normally that dark in there or is that the camera? If it's too dark they can't see the navigate to the roosts.Here is the roosting spot. Next pic is the chicken doorway that can be shut, top is a window of double pane plexiglass. Last is the nesting box for 6 hens, four regular and an "open top" one on top, just put a railing around the top to hold the straw. Oh, and you can't see it very well but it does have a rough hewn lumber ceiling. I had had dowels on the steps up the ladder but read they don't really like the round roosts so changed it out to pieces of 1 X 2.