Hi, We live in Maine, have our first flock, and have a question about lighting and heat lamps. Should we keep the lamp on at night for heat? Does that mess up their laying cycle to have 24 hours of light? I read that you can leave the light on 24 hours to increase production, but I don't want to stress them out and would prefer they have a more natural rhythm. Any help would be greatly appreciated - my husband is scared they will freeze!