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I've used modafinil in concert with tDCS (http://en.wikipedia.org/wiki/Transcranial_direct-current_sti...) and have found it very beneficial except for some slight side effects (as someone else had mentioned in the thread, jaw clenching).

Did you build your own tDCS device?

Same thing here. I was thrilled to learn it could be prescribed for sleep apnea and was provided with free samples. I felt nothing. An acquaintance mentioned it did wonders for resetting the internal clock when traveling to different time zones, I'll try it again when that occurs.

There's a theory that there's a group of people that has a genetic mutation that makes modafinil not work for them. That might be the case for you?