Hi my chickens 5 large 2 small live in a shed thats 6ft by 4 ft they have a large totally secure run. My question is and I know this might sound daft but should I still be locking them in at night? Im concerned not about foxes etc but the cold. They have a small entrance out of the wind but it feels so cold in there, they seem happy and put themselves away at dusk and trot out at dawn. Ive ordered a polly tunnel to put up for them but is this being over protective?