May 05, 2014 · OS X supports putting a display to sleep after a period of inactivity, which you can set in the Energy Saver system preferences; however, in addition it supports several options for immediately putting your display to sleep: The Terminal. Open the Terminal and run the following command: pmset displaysleepnow; The keyboard

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OS X will stay awake during most long running tasks. The behaviour will depend on the software downloading the file. Safari and Transmission, for example, both ask OS X to stay awake while a download is ongoing. Applications need to lodge power assertions with OS X that explicitly stop the computer sleeping.

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