I used to describe Modafinil as "the best sleep you ever had, in pill form". As someone with chronic sleep issues and ADHD, it allowed me to function during some of the worst months of my life.

The way I eventually settled on to 'dose' Modafinil is two pills (200mg) on Monday morning, then one pill on Wednesday morning; this kept my serum levels at a level where I got the positive effects for a whole work week, yet could still relax on the weekend.

I haven't been in a situation where I felt I needed this for a while, now.