I have two Rhode Island Reds that are 7 months old. They free range in the back yard and have a cage that they can go into and out of freely, where their water is and the lay their eggs. They also sleep in their cage, in the back corner inside of a planter - it's where they chose to sleep the first day we got them (when they were 2 weeks old), and have slept their ever since. They have always gone to their cage at sunset and slept until sunrise, until 4 days ago, when I found them roaming the yard at midnight. This has happened every day since then. At first I thought they were just feeding at night since it is so hot in the day. But now I noticed that they have been sleeping on the ground right outside the back door instead of in their cage. Any idea what's going on here?