We have 2 seven month old chickens. Their run is 6'x6' with a small wooden coop attached to the side of the run. During the day they have free range of the yard and we lock them up at night. The run has a wooden pole near the top for them to sit on. Before they started laying they would sleep in the wooden coop every night regardless of the temperature outside. Since they started laying they will only go in the coop to lay eggs and otherwise sleep on the pole suspended above the run. Are my chickens not very bright or do they not want to sleep where they lay their eggs? Should I be offering them an alternative for egg laying? My main concern is how cold it is getting (below freezing) and the run is just chain link fence (so not protecting them from the elements). Any advice would be greatly appreciated!