FWIW:I was recently very under-slept and cranky on a Friday afternoon after a long, grueling work week. I had to finish things up and didn't want any more caffeine nerves - thinking that I would have to sneak in a short nap somehow instead.
I had the most dramatic eurogenic effect ever after taking 100-200mg of bright yellow Eugerafinil under my tongue. I soon felt relaxed and well-rested and in a subtly good mood. Not the dopamine-stim type drive that MOD may give me the first few days I use it. More like just having had a great, little nap and ready to tackle the day. It was surprising even to me, someone who has tried about every legally available stim and energy boost going, and made me re-evaluate the role of serotonin vs. dopamine response in these kind of uses.
As others described, it lasted maybe 4-6 hours or so, then I was definitely falling back into an even more cranky and tired mood afterwards during the long drive home. I don't know if this was some withdrawal effect, or just the stress and sleep debt finally coming back to collect it's normal due.
I just ordered some Hydrafinil to compare, and intend to keep one of these on hand for those occasional impossible afternoon slumps. The quick effect and short duration is a plus in those situations.
From this recent experience, this seemed definitely more targeted, useful and pleasant than normal caffeine or MOD/ARM, or even Adderall, use. Whether I will develop a tolerance to this dramatic effect upon very moderate use is still unknown (and it WILL be moderate, not knowing the long-term effects).
Edited by lad3, 22 March 2016 - 03:53 PM.