Originally Posted by rowan

I have been diagnosed with sleep apnea, tried a CPAP machine, it worked once (I literally sprang out of bed the next morning) then after that my nose started blocking up. I tried it a few more times, including after some weeks to make sure it wasn't a cold, but no go. I ended up returning it.

Using that machine has done some permanent damage; since then my voice has been more nasal, my nose airway always feels a bit more constricted (more effort to draw in or exhale via the nose only) and I have recurring problems with a blocked up or runny nose. So CPAP isn't always a magic bullet.