It is 80's during the day and 50's at night. My ladies are 5 weeks old today. Are they big enough to leave outside at night without a light? I have been leaving them out during the day but bringing them inside to sleep. Am I an over protective mom? When it gets dark at night they are all huddled in the corner (in the run area) and no where near the roost or inside the hen house. How do I get them in where it is warmer? This is my first chicken experience... Thanks!