I never had this problem before the pullets came along, and even they are usually good about going to bed with all the others. I just started driving 8' T-posts today to raise the chicken yard fence up to 6'. When that's done, I have a brand new roll of mesh for over the top. If I lose any more I'll be firing up the incubator a lot sooner than I wanted to.My girls are pretty good with bedtime; even the sultans know the drill now.