Hi I'm 14 and I'm pretty short, I'm 5'4 and most of my friends are 5'7-5'9. Since I was 12, I've been getting 6-8 hours of sleep and after school I take 1-2 hours of a nap and I heard it affects growth. If i start now getting 8-10 hours of sleep will it help? Or I won't grow much after my growth spurt... I think I got 2-4 years left to grow...

How long I should sleep a day?
My parents are 5'1 and 5'11

About how tall will I be at full grown height?
If this changes my growth spurt, I don't have hair on my armpits yet, but I do have some on my balls.