Fenced in a 10 X 25 area for my 10 6-7ish week old chicks. Built a temp coop for them. This got them out of my barn... Went to all this trouble and they just stay in the coop. Except for about 8:30pm last night as the sun was going down, and then I found 6 of the 10 laying in the grass at 11pm. They were all in different spots along the fence. I kinda wanted to see what would happen at dark. Well, I had an errand to run and got home at 11. I scooped them all up and put in coop and shut the door(I normally shut it up at night). Why would my chicks during the day not want to go outside, (weather in Indiana sun and 75 yest and 79 today) but nest down and sleep outside at night. Is this normal behavior???