My ten chicks are 8 weeks old. They have been in their new coop for the past 4 weeks. A couple of days ago I weened off their heat lamp so now it is total darkness in the coop at night. When I put them in at dusk, so they can still see, it sounds like total chaos in the coop to the point where I actually open the door to see if there is a problem. They look fine, just loud. They seem to be settling, some perching, some in a chicken pile. Is this bedtime chaos normal as they settle in for the night?