I have POL pullets who like to sleep in the rafters. The area is secure and not at all drafty. My only hesitation in letting them continue is that I wonder if it's going to be a problem when they start laying. It's about 8 feet up and they tend to fly down from that height in the morning and land in the middle of the floor. The roosts we made for them are only 18 inches off the ground instead of 8 feet. I wonder if they might injure themselves or break and egg inside. If that is the case, I would close off the rafters to prevent them going up. My tall husband has been fishing them off the rafters and placing them on the roosts every night for two weeks because they are at the point of lay and we became concerned. We lost a hen who had an egg break inside her after getting caught in some netting so I get nervous about it happening again.