I have had sleep apnea for about about 8 years. I have been using my Cpap machine ever since. A friend of mine was selling a really good health device for people with allergies. he asked me to try it out for a few days. he told me to keep it programmed on medium. I have been using it for about 3 months and I will admit that I have not cpap machine for 4 months. I feel that I am really sleeping good..I keep it next to my bed. I think it works for me!!