hypersomnia
"I must say that viavarin has been a life saver.  I only take one tablet at a time, could not imagine taking 2.  It gives me approximately 4-6 hours of predictable energy. I feel when it kicks in and I know when I am coming down.  If I have a long day I take one early and one later but I usually cannot sleep if I have 2 in my system. 

Being a student...it really helps me focus. And personally I don't like the NoDoz, they take a longer time to kick in and thus, longer to wear off."