CPAP, or continuous positive airway pressure, is frequently used to treat sleep apnea.

In this procedure, the apnea sufferer wears a special mask over the nose while sleeping.

The mask blows air into the person's throat continually all night in order to keep the throat open and clear from obstruction - which is why this technique was named Continuous Positive Airway Pressure.

A CPAP unit is usually installed at the apnea sufferer's bedside by a sleep technician.

During setup, the technician sets the adjustable airflow to the pressure level recommended by the physician.

To be effective, the CPAP unit must be used consistently, and according to the prescribing doctor's recommendations.

Some people mistakenly believe that once the CPAP has eased their apnea symptoms, they have been cured and can discontinue using it.

Always check with your doctor before making any changes in your CPAP usage.