Hi , my 11 month old son was sick on Saturday night was vomiting all night , and had diarrhea the next day . he did get a lot better , but I notice him very sleep , yesterday he slept 12 hours for bedtime , then took two 2 hour naps . he also is drinking very few liquids .. But he is eating his food , should I be worried about dehydration ? Should I take him into the emergency room ?