CPAP stands for continuous positive airway pressure. It is used in Obstructive Sleep Apnea cases, it is a machine that has a mask or nasal piece with it, that a person wears at night to keep a continous + pressure in his/her upperairway so it doesn't collapse throughout the night, in the hopes that the person can have an uninterrupted nights sleep. **Goodluck Moose I have seen it do real wonders for some.**