When visiting someone, either invited or otherwise, it is best practice to just be yourself. Think about all the times you’ve been miserable at 1am in your own house, wiping pizza grease all over a set of high threadcount linens. Think about all the lonely nights in front of the computer drinking so much your kidneys hurt and leaving all of the trash from these activities spread haphazardly about the house. You should not abandon this behavior, it is expected and encouraged.