My 4 year old has been suffering from a night cough the past couple of nights. Sounds really chesty starts in the evening. He's been up being sick with it. Still croaky and chesty in the morning. Then about after 9 o'clock he's fine all day again. Would it be a cough or maybe hayfever. His eyes do look a wee bit irritated. His sister suffers from it but her symptoms are more noticeable. Sneezing. Watery eyes. Swollen eyes sometimes.