I have four hens, which are just starting to lay eggs. One of them, which is at the bottom of the pecking order, sleeps on the floor of the coop every night. We have a run attached to our coop, and we close the run door, but not the coop door. Would that be why she sleeps there ? (There is plenty of room on the perch) I also want to know if I need to give them grit even though their floor is dirt, and they get outside just about everyday.