If you go to power setting in Windows 7, there are "put the computer to sleep"
and in "advanced settings" there is "sleep after"
Both let user choose a time period like 10 minutes, what is the different?
These are the same setting. The first one just shows up in the basic customization page for the power plan, along with display-off time so these can be changed quickly, while the second one shows up in the advanced settings with detailed settings for many power options.