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This question already has an answer here:

In settings, I don't see a way to stop the PC from going to sleep.

marked as duplicate by bmike Oct 3 '14 at 18:22

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Go to sys pref -Energy

Slide the Computer and display sliders all the way to the right (to the never position)

sleep

If you prefer you can use the build in (by Apple) Terminal command "Caffeinate" to set specific non sleep modes.

https://developer.apple.com/library/mac/documentation/Darwin/Reference/Manpages/man8/caffeinate.8.html

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    Unfortunately my Mac doesn't have a computer sleep option. :( – Kay Oct 3 '14 at 19:18
  • The used the Terminal and Caffeinate. – Ruskes Oct 3 '14 at 19:55
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To temporarily stop your Mac from sleeping, you could use Caffeine, a widely-used, free utility available both through the App Store as well as a direct download from the developer's site.

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