When you see the kids with high score and sleep

very little, you kind know how they can do it. if they truly gifted. they will get enough sleep and get the same good score. Otherwise, they depend on something to keep them going. Don't tell me you can study for 18 H no sleep at all. you can try to do this to see what happen. If you say kids are interested on their GPA so they could do this. you cheat youself. This is also how medical profession get into this trouble and they have same reasons.