OS X Lion: Schedule your Mac to shut down or go to sleep automatically
You can schedule your computer to turn on, turn off, go to sleep, or wake from sleep at specified times. You might do this if you want to be sure your computer turns off when you aren’t working and turns on before you come to work.
- Choose Apple menu > System Preferences, and then click Energy Saver.
- Click Schedule.
- Select the options you want to use.
To schedule a startup or wake time for your computer, select the “Start up or wake” checkbox. Choose a day or group of days from the pop-up menu, and then enter a time.
To schedule a shutdown, sleep, or restart time for your computer, select the bottom checkbox and choose the appropriate option from the pop-up menu. Choose a day or group of days from the pop-up menu, and then enter a time.
Your computer must be awake and you must be logged in for it to shut down at the scheduled time. If you are not logged in or the computer is in sleep, your computer will not shut down at the scheduled time