My chicks just moved out to the new coop from the brooder. They are EE's and bantams about 6-7 weeks old. The coop is a resin shed with double walls and so far has felt fairly close in temperature to what they had inside. I do have sand as their bedding and they had shavings when they were in the brooder. They have roosts set up that are supported on stacked cinder blocks. Here's my question, at night all the chicks are piling onto the top of the cinder blocks. They are crammed on there just all sleeping together. There's a few that don't fit and they are sleeping huddled up on the sand but right next to one of the cinder block stacks. During the day, they are fine (they haven't been out to the run yet because they just moved to the coop) and I see them wandering around and roosting and sitting on the sand. They are used to roosts as they had them in their brooder and some of them roosted at night. Most of them slept in a big huddle in the middle of the brooder all together-not because of cold or room, just because. So is this normal? I don't know if I need to build them some kind of platform to sleep on at night, or if they are just cold at night or maybe they don't like sleeping on sand and I should switch it to shavings? Any advice or ideas would be great! These are my first chicks and they've always been together and fairly close even though there are big size differences!