I got my babes yesterday morning (they were 2 days old, hatchery chicks), and they spent basically all day eating, drinking, playing. I barely saw them sleep at all, except for occasional exhausted face-plants. Today, though, they're sleeping a lot. When they're up and around, they seem fine, eating and drinking, but they're much less active today. Is this normal, or should I be worried? They're getting only chick starter feed right now, no treats yet.