My four year old son recently had a pretty bad bloody nose in the middle of the night. He has has these before in the winter, so we didn t think too much of it. (There is a humidifier in his bedroom that runs all night every night, and we put Vaseline in his nostrils at bedtime.) Just a few days later, he had a meltdown from being overly tired, and his nose started to bleed again. Just a little this time; it stopped fairly quickly. After this episode, he developed a hacky, dry cough, and he s had another incident of his nose bleeding slightly when he started to cry. He doesn t have a fever, but this dry cough has persisted for two and a half days now, and he s never had nose bleeds this frequently before. We have just today added a larger humidifier in our living area of the house to see if that will help. He takes a high-quality multi vitamin every morning, and we are adding a children s C supplement now. Any ideas what this could be? (It hasn t been a particularly cold or dry winter here.)