I will definitely vouch for that; if I have four hours sleep (about 2 hours below my optimum) and I take Modafinil, it just brings me up to 'normal(ish)', although it still works. When I have a full night's sleep, it's like a full on turbo charge.
Which smart drugs in particular have you tried, and how do you rate your experiences?
Nootropic stacks are a personalized medicine, but I think the goal should always be to slow the appearance of time.
Anything that gives us more time is all good in my books :-)
Cg