how old? if theyre over a week and its warm in the house , i'll throw a cover over the brooder and pull the plug on the light when i go to bed .. give them some dark time .. if its cold dont do it though .. after two weeks or so, again if its warm, i'll shuffle the to an outside cage in the day, then back to the brooder at dusk, warm it up till bedtime, then lights out and covered, cuts down on dust also .. but all depends on temp .. if its too cold for all that, the brooder has to go to the garage, breaks my heart, i like them close lol .. but dust and noise goes critical fast especially with a big batch ..