I have 16 first time chickens from 6 1/2 weeks to 4 1/2 weeks, been outside in coop now for about 2 1/2 weeks but i left my heat lamps on at night, now lamps are off at night . and i got there run done about 2 days ago. now at night when i put them in they all huddle up by the door in a heep, cherpin like mad. then i will check in on them in a few min after its quited down some and they will be spred out in about 3 piles but its warm in coop say 80, are they just freekin out because of the darkness without the red heat lights or is this because of the run or what??? also they still pile up on the floor when will they start roosting on perch at night??? I want to take advantage of my poop trays i Made lol.