I close the pop door on my coops because my pens aren't predator proof (raccoons in particular) they are very good climbers.
I have feed and water in my coops 24/7, so if I forget to set my alarm before sunrise (5 am) the chickens can eat at first light with the east facing windows.
It sounds...
I use a light sensor nightlight inside coops.
I turn it off when I lockup the coops after sunset.
Both of my coops have east facing windows, no windows on the west side, so it's dark inside before sunset. GC