Ugh I feel you... I wish my body just didn't have the need to sleep. I have too many different things I want to do in one day, some of them work, some of them leisure. But I can't do all of them because just trying to stay alive takes so many damn hours from the day.
But, since right now we can't do anything about our mortal human condition, my advice is: Avoid high levels of stress at all costs. Making 10 or 20 pages each week is something you can only do if you spend most of your time on it, and not just 3/4 hours each day. No one can do that. You have to understand your limitations. If you're already doing everything you can just to get to 3 or 5 without risking death, then that's already good enough, and no one has a goddamn say about it.