my four year old son has a really dry nose inside and he kind of nlows down it every five minutes or so making a horrible noise like an old man. It's also really annoying him and me - anyhting I can do? I was thinking of puutting his head over a bowl of hot water with menthol over it or buying some kind of machine, forgotten what it's called that I borrowed from mys sister when my daughter had a cold which helped her breathe more easily, a dehumidifier or something, any suggestions?