I've noticed that my 4 week old chicks are cheeping loudly each night now as it begins to really get dark. They have been used to no light now for a couple of weeks (I use a ceramic heat emitter for heat) and are eating/drinking, otherwise acting fine. I raised a roost to a new height earlier today and I thought perhaps they are fighting over who gets to be where?? They usually end up sleeping on the floor of the brooder still. It's like they don't know where to be before bed. Is this normal that they should be so loud at this time?