first time posting here in this section, cause see i was looking for a pschology section and this about as close as i could get. if this is off topice feel free to delete. anyway, so i have this funny thing that happens once in a while: if i spend like 1.5 hrs doing something that excercies my brain, like solving some problems or something (not mindless hw), then i get this like 'high' that lasts about 1 hour after. its like your brain feel all clear etc. just wondering if anyone else has this feeling...? or am i clinically insane?