for me its more culmative

if ive been learning alot then go and train (ie learn more) or go out dancing and then dont get much sleep

and this carries on for a few days (sometimes weeks if im feeling particularly manic) i start to exhibit flu like symptoms and my concentration levels go down

im not very good at stayimg still but training or dancing helps me sleep and yes i do learn better when rested

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"....if you're ever attacked by someone armed with a banana, your first thought has got to be to eat that banana. Thus leaving him unarmed and defenseless." - ace