Sleep for me makes no sense?

ok durnning the summer i get up at 5:30 am then all day long USUALLY i sont do anything but stay in the house by around 7 i find myself tierd and go to sleep thats 13hr30mins of day time doing nothing and 10hrs30mins of sleep time i sleep thru the whole knight soundly but when i wake up im extremly tierd but during school days i get up at 6 and go to bed at 10pm thats 16hrs! of daytime doing gym walking around talking doing work and im not all that tierd in the mornings. i dont understand