But another sleep apnea sufferer, Joanne Murphy of Rancho Santa Fe, found great relief in one of the several variations of the CPAP device, known as the bi-level positive airway pressure, or BPAP, machine. The bi-level simply supplies more pressurized air breathing in than out, thus reducing the often disconcerting feeling of exhaling into a wind.
"The difference for me was like night and day," said Murphy, 50, a former saleswoman and singer. "You wake up and you don't ache, you feel rested and it's like, 'Oh, my God. It's a beautiful morning. Is this how everyone else feels?' "