I've read somewhere some statistics that said people who sleep less than 6 or more than 8 hours tend to live 5-10 years less than average.
I also read that sleeping that much is really unhealthy, and the reason you need so much sleep could be because you've gotten used to it, your metabolism, as well as mentally (it became a habit).
One more thing you should consider is it's kinda sad if you have no reason to get up, so you might also want to go out and find something that's worth waking up early
P.S.: I'm no expert in such things and it's possible the numbers are not absolutely accurate, I'm just trying to help you