I have 27 five-week old chickens of mixed breeds. They are housed in a coop with an attached fenced-in run that they absolutely love going into every morning. They have been going in and out of the coop just fine all day and at night around 8:30-9:00 they all go in to bed. I usually go down around that time and lock up the coop and say goodnight to them. The last two nights have been very weird as when I get down to the coop, 19 of the 27 are sleeping outside in the corner of the run right by the door going into the coop. The other 8 are in the coop on their roost sleeping. The 19 that are outside are also sleeping and hardly move when I come into the run. I try to get them to go into the coop but they just stand there and chirp. I have to physically pick each one up and put them in the coop. They settle right down and go back to sleep in the coop but I think it is just odd that until two nights ago, they were going to bed on their own. I know chickens are creatures of habit so I am concerned that I will have to put the 19 to bed every night. Does anyone have any ideas why all of a sudden they are falling asleep outside? I live in Wisconsin and this time of the year our evenings are still cool. Last night it was close to freezing.