Howdy! I have 3 grown girls, but I just picked up 3 more day-olds. I have a brooder made of a tub, with food and water, and a lamp with a 75w bulb. Its around 100 in there, but I was wondering if I keep the light on all day/night. Seems like they'd have a hard time sleeping with the light on, but I don't want them to catch a chill. Help? Thanks!