I was heading out every night and doing the chicken chase game to get them in the coop. One night I was a little late doing it since I had to pick up my oldest from work. Didn't make it back until just after dark. Headed out there with the flashlight and my running shoes on. Darn things were all in the coop and snoozing, all I had to do was shut the door. Try going out a bit later and see if they discover they can tuck themselves in.