I have a red heat lamp in the coop that I turn on during the day if the weather is really cold. I always turn it off right before the chickens go to roost so they are used to sleeping without any additional light. Yesterday evening DH and I were going out for the evening so I made sure the chickens were in the secure run before we left, but forgot to turn off the light. When we got home around 9pm, they were all on the roost, but wide awake. I turned off the light and I swear, it seemed like they sighed with relief! So, I'm wondering - would they have just stayed awake all night if I hadn't turned off the light? I kept a red light on them day and night when they were chicks and they slept whenever.