A 20-minute assessment of sleep latency, administered 4 times a day at 2-hour intervals, beginning 2 hours after nocturnal polysomnography, measured time to sleep onset after a patient was instructed to remain awake while seated in a dark room without stimulus.

My personal record (longest time to onset) without Provigil as recorded at the Princeton Hospital's sleep clinic was five minutes; with medication, I can stay awake for the duration.

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