Ive been running a lamp in my coop over the last month to serve several purposes. (egg production, heat for the chickens, and to keep the water thawed) I noticed now that when I turn the light off they stay in the run all night. Its like darkness caught them off gaurd and they couldnt find the coop. Tonight, I waited until they were inside and then I turned off the light. I checked on them a hour later and they were all sleeping in the floor. Not on the roost where they normally stay. Will I have to re- teach them to roost before dark like I did when they were young? They are 11 months now.