Sleep apnea treatment not enough? study probes lingering drowsiness

This study looks at why many people with obstructive sleep apnea still feel very sleepy during the day even after successful treatment with CPAP or other devices. Researchers will test 100 adults to see if the amount of oxygen drops during sleep before treatment predicts this leftover sleepiness. They will also compare simpler alertness tests to the standard, hard-to-get Maintenance of Wakefulness Test to find better ways to check driving safety.