I am new to chickens, and got my first chicks yesterday. They were chirpy and took to water quickly. The light/warmth seemed to suit them. I put electrolytes in their water. This morning, I found one had died and the others are sleeping or listless, and when I try to jostle them, they go right back to sleep. They aren't chirping and don't seem as energetic. I'm not sure if this is normal or a sign of trouble. What should I do?