Hello, we are first timers and our first bunch of girls is now 8 weeks old and enjoying their new coop. But they are still afraid of the dark! How long do we need to keep a light on all night for them? If we turn it off they all pile up in front of the door and make dreadful little noises. As soon as we turn the light on they will go back into the coop and go to sleep... Bless their hearts! Has anyone experienced this before? Thanks ahead for any info!