I have 6 chicks, 2 that are 2 weeks old and 4 rhode island reds that are 8 or so days old (I have had them since last Friday). While all the other chicks eat and drink, I have noticed in the last hour or so that one of the rhode island reds sleeps and has not eaten or drunk any water. Is he sick? I have been giving them all yogurt in their water, and they are on medicated chick feed. Anything else I can do to encourage him to eat or drink? Or does he really need to just sleep?