First of all I wish to explain that my girls are housed in a secure fenced enclosure and run area which is totally fox and predator proof. Within this enclosure they have a small wooden coop where they go to roost at night and lay their eggs in nest box. I currently shut the girls (four ex bats) in their wooden coop over night to keep them warm (currently coming out of winter here but still dips to around 3-5'c over night/early hours) In the uk at present dawn is approx 6:40am, so I'm getting up then to let them out into their run enclosure. However, over the next few weeks dawn will be getting earlier and earlier (approx between 4:30/5am) and I can't keep getting up at stupid o clock (obviously I am as I love them all). So I would like advice as to whether I can leave their wooden coop door open with these current temperatures, (noting that foxes or predators can't get them, as whole coop is housed within secure fenced enclosure), so that they can let themselves out when they want in morning and not fight each other until I let them out. Or..... Will they get cold over night if I leave their coop door open all night. They have deep straw at mo in coop and I have four girls. Coop is a small wooden coop meant for approx 5/6 girls. I do fuss my girls too much but don't know if they'll handle temps overnight or not. I know I wouldn't want to spend all night out their with door open! Thanks in anticipation for your replies.