1. Confirm that Amphetamine is actually the app responsible for keeping your Mac awake

  • Open the Terminal from /Applications/Utilities
  • In a new Terminal window, type this command and press return:
   pmset -g assertions | grep "Amphetamine"
  • Observe the output from the command in the Terminal window

If Amphetamine is keeping your display awake you will see one of these two lines in the output:

PreventUserIdleSystemSleep named: "Amphetamine - System (Single Use)"


PreventUserIdleSystemSleep named: "Amphetamine - System (Trigger)"

If you do not see either of these lines in the output from the Terminal command, Amphetamine is not keeping your Mac awake.

2. Look for other applications that may be keeping your Mac awake

3.  Double-check that your Mac is allowed to sleep

  • Visit  → System Preferences → Energy Saver and review your selections.

4. Did Amphetamine crash or was it forcefully quit?

For normal sessions, even if Amphetamine crashes, its power assertions should be released and will no longer keep your Mac awake. The one exception is if you were allowing Amphetamine to keep your Mac awake while its display is closed. If Amphetamine crashes or is forced to quit while preventing system sleep while your Mac's display is closed, you'll need to do the following:

Reboot your Mac, or install Amphetamine Enhancer as a fail-safe for this situation.

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