I thought chickens were supposed to sleep on a perch - I found my two 6 week olds lying down flat out in their bedding last night - necks extended on the floor? Is this normal? I am worried as the coop I have only has a perch area once the nest boxes are in, which I am not putting in until they are older - so if they like sleeping on the ground then there won't be room. Just a young chicken thing? Any advice welcome.