OS X Yosemite: Set sleep and wake times for your Mac

Choose Apple menu > System Preferences, then click Energy Saver.

Do any of the following:

• Set the amount of time your computer and display should wait before going to sleep: Drag the Computer sleep and Display sleep sliders.

  For example, if you want your computer and display to shut down immediately after you stop using it, drag both sliders to 1 minute.

• Put hard disks to sleep: Select “Put hard disks to sleep when possible.”

• Keep your Mac turned on whenever power is available: Select “Start up automatically after a power failure.”

• If you’re allowing other users to access shared services: Select any of the available “Wake for…” options, for example, “Wake for Wi-Fi network Access.”

  (Different options are available, depending on how you’re connected.) For more information, see Share your computer’s resources when it’s in sleep.

• If you use an Airport device or Apple TV: Use Wake on Demand (on your Mac) and Bonjour Sleep Proxy (provided by an AirPort device or Apple TV) to save energy and reduce costs while still ensuring full access to all your shared services.

  For more information, see the Apple Support article About Wake on Demand and Bonjour Sleep Proxy.

Choose Apple menu > System Preferences, then click Energy Saver.

Do any of the following:

• Set sleep times for when you’re using your portable computer’s battery: Click Battery, then drag the Computer sleep and Display sleep sliders to set the amount of time your computer and display should wait before going to sleep.

• Set sleep times for when you’re using your portable computer’s power adapter: Click Power adapter, then drag the Computer sleep and Display sleep sliders to set the amount of time your computer and display should wait before going to sleep.

• Put hard disks to sleep: Select the “Put hard disks to sleep when possible” option in the Battery or Power Adapter pane.

• Keep your display dimmed while using your battery: Click Battery, then select “Slightly dim the display while on battery power.”

• Update your system while it’s asleep: Select “Enable Power Nap while on battery power” in the Battery pane, and “Enable Power Nap while plugged in to a power adapter” in the Power Adapter pane.

  For more information, see About Power Nap.

• If you’re allowing other users to access shared services: Select any of the available “Wake for…” options in the Power Adapter pane, for example, “Wake for Wi-Fi network Access.” (Different options are available, depending on how you’re connected.)

  For more information, see Share your computer’s resources when it’s in sleep.

• If you’re using an Airport device or Apple TV: Use Wake on Demand (on your Mac) and Bonjour Sleep Proxy (provided by an AirPort device or Apple TV) to save energy and reduce costs while still ensuring full access to shared services, for example, a printer connected to your Mac.

  For more information, see the Apple Support article About Wake on Demand and Bonjour Sleep Proxy.