I want my sleeping time.

I seriously need to sleep, I have not sleep for at least 8 hrs and yes 8 hrs of sleep is enough for me. Is not that i do not want to sleep, is just that i can't sleep. You know what i sleep late and get up super early like around 8.30. After that i starts to feel tired in the afternoon and sometimes if i dun take afternoon nap i will get tired around eveningthen suddenly i become super awake at night...mygod!