My senior year of high school saw me begin to take caffeine pills so that I could get everything done. It was my effort to create more hours in the day so that I could do school, work, my band, and my girlfriend at the time and not drop any of the balls i was trying to juggle.
I recommend against doing this. I remember being about two clicks shy of having a nervous breakdown the whole time I was taking them, and it was a pretty miserable time all-round.
Suggest your brother learn to manage his time better, and stop screwing off so much so he can just get in bed earlier. It's a healthier and much more easily dealt with way of going about things.