I agree with letting the Power Options do the work.
I like to be able to walk away without concern about saving my work whether I come back in an hour or a week. If I set sleep to 30 minutes it is at the ready to jerk back awake if I quickly return, then after an hour I let it hibernate which is the same as shutting down - except that it writes what was left out on the desktop to the HD and starts back up much quicker.
All good reasons for using the modern Power Saving features perfected in Windows 7.
If I don't have a mandated restart for Updates every few days then I restart anyway.