Grandpa awoke with tears in his eyes. He knew something was wrong and it saddened him. He sucked air through the nose mask. The CPAP machine hissed. The air that did not go into his lungs escaped through the tiny holes at the junction of the air tube and the mask. "Shhhh." The forced air hissed at him to be silent. The positive air pressure breathed with Grandpa and prevented him from snoring but it could not prevent his...