It's a small machine with a hose and mask, used to make sure your breathing doesn't stop at night. First it has to be diagnosed, that requires wearing an electronic gizmo (usually at home, can also be done in their lab for more money) during normal sleep times. My results showed my breathing stopped 70 times an hour, which is only good if I were trying to confuse assassins who use pillows to smother their victims.
No I don’t have one of those . That’s not the problem I have. It’s a low heart rate.