tired all the time

I can sleep for about 10 hours, and wake up feeling decent. Then like 5 hours go by and i literally cannot function - i feel as if i can go back to sleep. It feels as if my brain itself is asleep but my body is still trying to work.
It's always been like this but its just getting frustrating as I have to revise but then i just crash in the middle of it. I've been trying caffeine like coffee, i literally hate it lol. I've been trying to introduce more foods with energy like bananas, oats, brown rice, eggs and beans though its hard to tell if this is working bc its only been a week.
I've always had some sort of problem with sleeping so i've told my parents but they just said I have to go to bed earlier but that would be at 9pm which would then push back my work. I don't think its burn out as i'm physically tired and not so much mentally.

Have you ever thought of checking with a doctor?
I had the same problem for most of last year, I went to the doctors to get a blood test and it turned out I was anaemic, I took iron supplements daily for 3 months and it really helped me a lot, now I can sleep for almost 5-6 and still be able to function as normal the next day.