No, thanks. Misreading the title made me realize that I need to stop working tonight since I'm too tired to make real progress. New idea- site which gives you

No, thanks. Misreading the title made me realize that I need to stop working tonight since I'm too tired to make real progress. New idea- site which gives you a brain teaser/ test at XXpm/am in the evening to help you realize if you are not pumping on all cylinders.