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CPAP simply improves flow of oxygen so you are able to breathe better. It doesn't cause listlessness. That sounds like something your local doctor needs to evaluate. It may be that your CPAP isn't adjusted right so that you aren't getting the full benefit from it, or it may be something entirely different causing your symptoms, such as anemia, or a thyroid problem, or you may need the dosage of any medication you are taking adjusted.