We had a cold spell, and I started keeping a red heat lamp on all night in the coop. My coop has a window, and you can see inside from my bedroom. When the light was on, the chickens were hanging out and not really going to sleep until about 10:00 pm. Sort of like a trip to Vegas for the peeps. We had a really warm day, and yesterday I let the chickens out to forage in the yard at about 3:00 p.m. They have not been allowed out to forage very much lately, and they were very happy birds. We have a street light sort of light in the backyard, so even after dark it is not pitch black. In the past, when it got dark, the chickens would put themselves up and then I could lock the coop. This time, 45 minutes after dark, I'm still hanging out with the peeps in the backyard. They were running around like it was noon. I'm not sure if they ever would have gone home to roost. And catching chickens in the dark is a pain, as it turns out. I'm not totally sure that the heat lamps changed their behavior. They may have just been happy to have warm weather and finally be allowed out for an extended period. However, it seems like they forgot about the whole going to bed thing after being kept up by a heat lamp. Has anybody else ever seen this happen after using a heat lamp? While it seems like a reasonable thing to use when it is very cold, it seems like maybe it is also hard on the birds in other ways. Any ideas?