Teenage sleeping heavy?

i am a 16 year old boy and a very heavy sleeper, i can sleep for 11 hours and still feel sleepy, it wastes my morning, very annoying!! as i turn into an adult, will my body's demand for hours of sleep decrease? for example will i be able to sleep for 9 hours and get up at 8 or 9 in the morning feeling refreshed and not tired? thanks :D