I've never used Modafinil, and I don't want to seek a prescription, nor is it legal to import here without one.
So I ordered some Adrafinil (Olmifon) - as a next best option. My understanding is that Adrafinil is the pro-drug version of Modafinil. This (as I understand it) means that the Adrafinil metabolizes into the same components in your body, and then takes the same action as Modafinil, simply delayed by about 45 minutes.
Having never taken Modafinil, I have no point of reference. With that said, the Adrafinil doesn't really seem terribly powerful. I took 300mg the first time I used it - with no noticeable effects. I took 600mg the next time, and even increased to three tablets (900mg) on a third attempt. I'm not sure what I expected - I suppose I expected a generally more alert mind.
What I definitely DIDN'T expect, was to fall asleep!
I fell asleep studying, having taken 900mg of Adrafinil two hours prior, on a night that I wasn't particularly exhausted to begin with.
To be clear, I'm not suggesting that the Adrafinil put me to sleep

What's going on here? Are the effects simply really really subtle?
Is there more to Adrafinil than simply waiting an extra 45 minutes? Are there other dosage considerations, or food combinations neccesary to cause it to mimic the effects of Modafinil?