I think it's different than it used to be. When I was in high school I took it a few times and it knocked me the shit out. I would try to fight it and stay up playing Diablo 2 to see how long I could stay awake and the hallucinations would kick in like the game coming out of my screen and shit. I could usually make it a couple hours at most.
Nowadays I could take 3 and not blink. When I flew to spain in my last year of college I took 2 on the flight over hoping I could sleep since it was a night flight and I even took it with a drink...nothing. I never felt groggy though when I was younger.
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