I've been using a CPAP machine for almost 10 years. I am not overweight (6'-6", 220 lbs.)People ask me if I sleep better and I tell them that my wife sleeps better now that I'm not making all kinds of noise. I tend to hold my breath while I sleep on my belly. My wife says that I hold my breath for over a minute, then squeal slowly while I exhale, gasp for air, then start again.
There are all kinds of CPAP equipment. Your Dr. will prescribe a machine and mask, but don't be afraid to tell them if your not comfortable. I've tried several different masks over the years and never liked the Darth Vader over the whole nose mask. I've found a mask called SNAP made by Tiara that works with "pillows" that expand in your nostril which for me creates a much better seal, is light weight, and doesn't block your vision say if you watch TV in bed. A great place to check out equipment is CPAP Supplies Plus
I had another sleep study about a year ago ( I found out they recommend you have them every 3 years ) and got a new machine. This one is almost silent. Plus I found out that insurance will get you a new mask and tubing every 6 months to a year.
Don't ignore this. When you hold your breath your brain doesn't get enough oxygen so your heart has to work overtime. Only so many ticks in the ticker. Use them wisely.