Cheers Sekio - guess the reason was too high a dose on my part - started quite early in the day, then by 7pm plugged my last one, was still up at 5am despite having had 1mg clonazolam.
I think I'll avoid this one as there was a sense of fast diminishing returns - perhaps best use as a mild functional pick me up early in the day for me.
Don't feel too low mood wise today - just exhausted from the whole thing, and zombified from the clonazolam I took.
Haven't messed around with stims in almost 2 years, now I remember why!