If you are found to have obstructive sleep apnea, you may be asked to spend another night in the sleep lab. The procedure will be the same except that you will be introduced to a CPAP machine (stands for Continuous Positive Air Pressure). They will introduce you to it and explain it before you even lie down to sleep. After going sleep, the technician will gradually increase the pressure until the obstruction(s) are counteracted (if possible). However, this will be so gradual that you probably won’t even realize that it is happening. You do NOT have to worry about suffocating in one of these masks even if the power goes out. The full-face masks have a special valve that opens if the power is interrupted. The nasal masks do not cover your mouth, so your mouth is free for breathing if the power goes out.