I have had a nasal condition for about 4 years which keeps my nose blocked most of the time. Vicks nasal spray helped, but the doctor told me that constant use of it caused me to actually destroy the inner lining of my nose, making it worse, which it did cause I use to take it once before bed at the beginning, then it turned into once every few hours.
He put me on a different spray which helped cause I don't feel as blocked up all the time, but it still effects me at night. It's like if I lie on my right side, my right nasal passage gets blocked and my left opens and vice versa.
It's liveable, just really annoying. Also I am short sighted too, but don't really mind that.