The best thing to do is probably to sleep as much as your body tells you to, which in your case happens to be 6.5 hours (It can depend on genetics), and in my c

The best thing to do is probably to sleep as much as your body tells you to, which in your case happens to be 6.5 hours (It can depend on genetics), and in my case ends up being more than 8 hours. Forcing yourself to sleep longer probably isn't a good idea.