One time a has some task to optimize an images on mobile application so it can swipe on list without lags (to this time it works fine, there was microseconds lags, but it was my code and I don't like to leave like this). I takes me a long time trying a lot of solutions but everytime was the same. I leave this task because I thought it can't be done. Everyday I was thinking about it, one time I have even a dream about programing XD. One morning I wake up and it came to me, one simple solution (I think there was 2-3 lines of code to change). I go to computer and try it, it works, it was a weight off my mind. Of course I go to boss say now we have faster, better etc. and he also was happy :)