Depending on the computer you're using, you can specify times for your computer to start up and shut down or to wake up and sleep. On newer Macintosh models you can set both pairs of options, but implement only one at a time. On older desktop computers you can only schedule startup and shutdown; on older portable computers, you can only schedule wakeup and sleep.

To schedule, you use the Energy Saver control panel. Depending on your computer model, the section is called "Schedule," "Scheduled Startup and Shutdown," or "Scheduled Sleep and Wakeup."

Open the Energy Saver control panel for me.

Related topic

System sleep and saving energy