"People with sleep apnea, they fall asleep at stoplights, they fall asleep at meetings during the day," Belenky said. "They'll deny any sleepiness and nod off right in front of you."
Train derailment fuels sleep apnea screening talks →
"The person basically gasps himself awake," said Dr. Gregory Belenky, director of the sleep and performance research center at Washington State University. "It's very much the functional equivalent of waterboarding."