WinSleep for Windows

The description of WinSleep - Play With New Friends

Allows your computer to sleep when not busy; shows a sleep/awake timeline.WinSleep keeps your computer asleep (while not too busy) as much as possible during periods you specify. Provides a detailed time-line graph showing when your computer was awake, asleep, or hibernating. Provides convenient Sleep and Hibernate buttons for manual use when desired. Shows the current CPU/Disk/Network usage percentages for your computer.