Chickens don’t mind a little light during the night at all.
It’s good to have a light and airy coop.
Mine prefer to roost at the extension I made some years ago which is very light and airy. The old darker coop was abandoned by choice. Only the nest boxes who are attached, are still in use...
Normally chickens sleep during the night. But not at all times. I know roosters can crow in the night.
Install a camera with night view, if you like to know what’s going in.