In a technique for collecting and analyzing physiological signals to detect sleep apnea, a small light-weight physiological monitoring system, affixed to a patient's forehead, detects and records the pulse, oximetry, snoring sounds, and head position of a patient to detect a respiratory event, such as...http://www.google.com/patents/US6811538?utm_source=gb-gplus-sharePatent US6811538 - Sleep apnea risk evaluation
