I'm personally too paranoid about predators to let my birds sleep in their run. When I first moved my chicks out of the brooder and into the coop, I locked my birds in the coop for about a week. Sometimes I would let them in a pen outside, but I would manually put them back at dusk. After a week. I moved the food and water out of the coop and into the run (I don't leave food and water in the coop, too messy), then left the coop door open for the birds to leave/enter at will. They went inside the coop every night. You may want to try something like this, but if your birds are already exposed to the run, I'm not sure it will work as well.