SO MUCH to do, so little time. Between a hectic work schedule and a thriving social life, Yves (not his real name), a 31- year-old software developer from Seattle, often doesn’t have time for a full night’s sleep. So he swallows something to make sure he doesn’t need one. “If I take a dose just before I go to bed, I can wake up after 4 or 5 hours and feel refreshed,” he says. “The alarm goes off and I’m like, let’s go!”

Yves is talking about modafinil, a stimulant that since its launch seven years ago has acquired a near-mythical reputation for wiring you awake without the jitters, euphoria and eventual crash that come after caffeine or amphetamines. Yves has been popping modafinil on and off for the past three years and says it is “tremendously useful”. “I find I can be very productive at work,” he says. “I’m more organized and more motivated. And it means I can go out partying on a Friday night and still go skiing early on Saturday morning.”

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