After Big Mama hatched her chicks I decided to put a heat lamp on the brooder. The brooder is a large dog crate and the nest box she's in with the chicks is a cat box that I've attached to the crate, so they have a run area to come out to. I thought the heat lamp would help Big Mama keep the babies warm and I have left it on for the last 3 days 24/7. It's on the opposite end of the dog crate. Now I'm wondering if that's the right thing to do for Big Mama? Does she need dark time?