Good gosh - every time I check in on the chicks they are always happily hopping around the crate, eating, stretching...doing whatever it is that 3-day old chicks do...but they never seem to be sleeping! I had assumed at night time they would settle down and go to sleep - but its getting pretty late and they're still up and about. Is it OK that they are still so active? (this might be a silly question, but hey, its my first time with chicks - I certainly dont know!) Thanks!