I am wondering if it is okay to leave the door to the coop open during the night? They have a secure run and there are no predators around that could get them. I live in Northern Norway and the only possible offender would be an eagle (though I've never heard of them taking anything domestic), but the run is covered with a net. Objections to leaving the door open that I have seen have mostly been about predators. However, my worry is more about a possible draft. I have left it open during very warm nights to allow for a better airflow (I do have ventilation), but have closed it when it's been wet and windy. I would prefer to leave it open as much as possible both because it's easier for me, but also because I go to bed before they do and rise after they are already up, which means they are confined to the coop until it suits me.