My mom has sleep apnea and she had no idea. She slept in the bedroom next to mine and I couldn't sleep at all! I went and got my tape recorder and had it in my room for about ten minutes and then I put it in her room for about ten minutes. The next day I let her listen to it and she was so suprised at how LOUD she was. She went and had a sleep study. The next year my uncle was diagnosed because his daughter did the same thing I did. My mom and uncle both have to sleep with machines and night now but at least they don't stop breathing in their sleep anymore.