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SafeSleepOnce puts your Mac into safe sleep once and automatically enables normal sleep afterwards.

If SafeSleepOnce cannot be opened, you have to adjust the settings of the OS X Gatekeeper as I am not a developer identified by Apple.

Screenshot of SafeSleepOnce


Would you like to donate?


Please contact me by email and mention which versions of SafeSleepOnce and Mac OS X you are using.

What is safe sleep?

Safe sleep is also called deep sleep, hibernation or suspend-to-disk, whereas normal sleep is also called standby or suspend-to-RAM.

The differences are:

  • Normal sleep is fast but uses battery since your memory is not shut down. The LED indicating that your Mac is sleeping is on.
  • Safe sleep is slow but does not use any battery since your memory is shut down too. The LED indicating that your Mac is sleeping is off.

SafeSleepOnce should work on Macs introduced after October 2005.


  • When SafeSleepOnce is launched, you are asked for confirmation to enter safe sleep. This dialog can be disabled in the preferences.
  • If you press and hold the Alt or option key while launching SafeSleepOnce, the preference window will be shown.
  • In the preferences you can reset your Mac’s sleep mode. Under normal circumstances this is never needed.
  • Clicking the SafeSleepOnce icon in the preference window will enter safe sleep.

Known issue: Entering safe sleep instantly after waking up from normal sleep, will put your Mac into normal sleep. OS X is blocking safe sleep for several seconds after waking up.


The changelog shows the changes made to SafeSleepOnce in each version.

Source Code

Please contact me to receive the current source code (AppleScript) as an Xcode project.

Thank you

  • Tobias Hildebrandt (icons)
  • Sopl Wang (code)
  • João Tiago Pinto (code)