Hi, I'm new to chickens...love them. My question is: Do they have to be locked in their coop at night or can they go in and out if they want of their coop into their run. Their run and coop are enclosed of course and the coops are inside a Chain Link 10x10x6 enclosure that has smaller wire mesh buried and up about half of each panel. I also have hot wire on the bottom and the top of the enclosure. Can you say overly protective. In the winter months I can shut them in so they will stay warm and cozy. Second question, what is the best bedding for the nest boxes? I am going to use the sand/gravel method on the floor under the roost as well as the entire run and enclosure. What do you think about that. Thanks for your comments and assistance.