Depending on your requirement, you can activate Caffeine from a few minutes to a few hours or even indefinitely, when you need background tasks to be performed without any interruption.
Thus, it helps applications to keep running over long duration of inactivity. Prevent Mac from sleeping when downloadingĬaffeine is a useful app that sits on the Mac OS X menu bar and prevents your Mac from automatically going to sleep. If you want to make sure a particular app is not paused automatically, but it doesn’t have the Prevent App Nap option in its Info window, there are some third party alternatives available to help you achieve the same. Prevent Mac from sleepingĪs mentioned earlier, OS X’s native feature to prevent App Nap may not be available for all the apps. Now, the App Nap feature won’t affect the activity of this particular app. If present, check on it to disable App Nap for that particular app.
Look for the Prevent App Nap option under the General section of the App Info window. Right click / Ctrl + Click on the app you want to disable App Nap for and click on Get Info from the menu. Open Finder on your Mac and click on the Applications tab from the left pane. This is because App Nap is disabled by default for iTunes. In this case, iTunes keeps playing music in the background. You can see this in action when you’re playing music in iTunes and the display turns off. If App Nap is disabled for a particular app, it won’t allow your Mac to go into sleep mode while it’s active, even in background. Of course, OS X did this to save power, but the feature is not really helpful in this case. When you resume work on your Mac, you might notice that background activity (for example, downloading files via μTorrent or other download managers) have been paused or that the internet had been disconnected while in sleep mode. And once sleep mode is activated, all your active apps will stop working. If you have a background app running with the App Nap feature enabled, it won’t be able to prevent your Mac from going into sleep mode. Eventually, the entire Mac goes into sleep mode depending on your configured power settings. The screen of your Mac automatically turns off after a certain duration of inactivity. 
And if that app isn’t currently doing something for you - playing music, downloading a file or checking email, for example - App Nap conserves valuable battery life by slowing the app down.”
“… OS X can tell when an app is completely hidden behind other windows.
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