I suffer with sleep apnea and have done for 9 months. a CPAP machine continous positive airway pressure. This machine supplies air via a tube and mask blowing air to keep your airway open and allowing you to breath, very basic
cpap machine is a device which helps you to keep your throat airways open. usually when someone suffers from sleep apnea,they face difficulty to keep their throat airways open and as a result they have trouble breathing.
so, i think you can figure out how much useful this device is.