Im ALWAYS TIRED no matter what. any ideas?

I take vitamins exercise sleep from 8-10 hours a day usually drink coffe in the morning and i dont ever wake up in middle of night and im ALWAYS ALWAYS tired. I had bloodwork done and my bloods fine no iron loss or anything. But i am positive im depressed. im on accutane atm so im waiting till im done with that for anti depressants. but ya im pretty sure its depression but is there anything i can do to help? i mean like before i fell asleep at 9 pm woke up at 10 30 next day. thats like 13 hours and im still drowzy and can take a nap.