DS has had a long and dreadful cold, his nose was streaming for at least 10 days. Towards the end of the cold he had a nose-bleed at night while he was asleep. He had another one early this morning which woke him up, about 5 days after the first. Should I worry about this or is it just that the the blood vessels in his nose are a bit weakened from all the sneezing and nose-blowing?