
During night sleep, sometime I would wake up by sneezing, running nose, etc., but if I turn on my humidifier, soon, probably within a minute, my nose stopped running and I could breath normally again.
This actually makes sense to me. The allergy sources, such as pollen, or dust, would be absorbed by moisture. That's why rain help help people feel better during the season because it washes pollen away.
Now I turn on humidifier even during the day, I tell you, it works!
P.S. Anything I write in blog are "personal experience".
P.S. Just heard that if you use carpet at home, using humidifier is not a good idea. I have wooden floor, which is not problem.