BiPAP (also referred to as BPAP) stands for Bilevel Positive Airway Pressure, and is very similar in function and design to a CPAP machine (continuous positive airway pressure). Similar to a CPAP machine, A BiPAP machine is a non-invasive form of therapy for patients suffering from sleep apnea. Both machine types deliver pressurized air through a mask to the patient's airways. The air pressure keeps the throat muscles from collapsing and reducing obstructions by acting as a splint. Both CPAP and BiPAP machines allow patients to breathe easily and regularly throughout the night.