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I have and would say the effects are kinda subtle. Really all I noticed was that it allowed me to sleep about an hour or 2 less a night and still feel completely rested the next day. I simply didn't feel tired at until later than usual and woke up on time feeling rested. Its hard to say if it removed the need for that sleep or it simply improved the quality of my sleep. For me that is not enough of a benefit to take a drug with unclear long term effects.