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The main reason a Mac won't go to sleep is because of a 3rd party app. If there was a list of popular apps that have been known to cause sleep issues, it would make debugging this issue easier.

Which popular 3rd party apps are known to cause sleep issues?

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2 Answers 2

Known to cause sleep issues:

Could potentially cause issues:

Apps that have never caused sleep issues:

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+1 for "Apps that have never caused sleep issues" being blank. –  CajunLuke Jun 22 '12 at 23:23

Also, the Apple Support Article "Why your Mac might not sleep or stay in sleep mode" is a must read when trying to resolve sleep issues.

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