The most common treatment for Sleep Apnea is a CPAP machine. Continuous Positive Airway Pressure, or CPAP, is a therapy treatment for OSA, as well as a BiPAP, or Bi-Level Positive Airway Pressure.
Both are used at night while the patient is sleeping by applying the amount of airway pressure needed to help the airways stay open and functioning well.
Note that a CPAP might not work for everyone. Some patients find the CPAP uncomfortable after trying different styles, and might switch to a BiPAP. A common complaint is that the machine is too bulky, too loud, or uncomfortable, but the newer models of the CPAP are quieter, more comfortable, and less awkward.