For the past week I have noticed a difference in my flock's roosting pattern. They get on the roost at about 6:30 PM EST but it isn't getting dark until a little after7.Then in the morning, at 7:30 AM none of them are off the roost and the aren't coming down even during feeding. There are 4 hens and one rooster. I have noticed lately that the ladies have been running away from the Roo and tend to go back up on the roost if he is in pursuit. Everyone appears healthy and we have checked the coop for snakes. I have had this group for three years and this is the first time I have seen any change. Anyone have any ideas?