Share your Mac resources when it’s in sleep
If you’re sharing your computer’s resources, such as a shared printer or Music playlist, you can set your computer to wake from sleep when other users access those resources.
To use this feature, you need an Apple wireless device that supports 802.11n and that has the latest firmware installed. See the Apple Support article Update the firmware on your AirPort base station.
Share resources for a Mac laptop
On your Mac, choose Apple menu > System Settings, then click Battery in the sidebar. (You may need to scroll down.)
Click Options on the right, click the pop-up menu next to Wake for network access, then choose an option.
Share resources for a Mac desktop computer
On your Mac, choose Apple menu > System Settings, then click Energy Saver in the sidebar. (You may need to scroll down.)
Turn on Wake for network access on the right.
When Wake for network access is enabled, your Mac wakes at the following times:
When a user at another computer accesses your computer’s shared resources.
At regular intervals so that your Mac can notify other computers on the network that its resources are available.