I'm 14, still growing a ton, I eat almost everything we have. I feel like I need more sleep but schoolwork keeps me up.
I read once that all we need is 6 hours of sleep . You young and growing. You should be fine. Only time i figure a person needs more sleep than 6 hours is they do hard-core work. To allow our body and mind to get the rest you need . But 6 hrs sleep is what these specialist in sleep study say our brain needed. Now if you start seeing things that aren't there and become paranoid then go see you doctor asap. . If become on edge jumpy shaky. You mind play trick on you. Those signs of your brain not getting enough sleep rest. . 5 to 8 hrs is what they say good sleep .
The number ought to be 8 - 10 for teenagers (7-9 for adults), and also important is a very slight recommended variation - min 7, max 11 (on the other hand, the body can catch up / adapt fairly well after several days of deprivation - recovery sleep). It's not just about growth, but your focus and mental aptitude.
As you can probably guess, the vast majority barely come close to this average, infamous staying up late and sleeping in on the weekend pattern.
Beg your pardon, but seriously doubt there's ~8hrs worth more of schoolwork outside the max 8hrs of school. What you must do is learn to manage your schedule - see what can be cut out, shortened, merged, circumnavigated (solved more efficiently). Notwithstanding, leisure time has its place. Excessive stress contributes to mental and physical instability / disorders, mustn't permit it to take control of your life. Shall only worsen as you age and more demands plug themselves in - courtship, family, work, high education, full burden of house upkeep.
My coworkers were split into a majority of young adults and a majority of more established ones (30s-40s), and the latter group would tell how having to drive, feed, care for their children on top of a full time job with insane (unpaid) overtime would reduce their sleep to very low quantities. We men are not given to grumbling in general, however the toll is palpable.