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For some reason my 2017 iMac running macOS 10.14.6 keeps waking up from sleep at exactly 5:59:39 AM every morning. If I look at the logs using pmset -g log at this time it consistently reports:

2019-11-07 05:59:39 -0500 Assertions            PID 77(powerd) Created UserIsActive "com.apple.powermanagement.wakeschedule" 00:00:00  id:0x0x900009fac [System: PrevIdle PrevDisp DeclUser kDisp]
2019-11-07 05:59:39 -0500 Assertions            Kernel Idle sleep preventers: IODisplayWrangler
2019-11-07 05:59:39 -0500 Notification          Display is turned on
2019-11-07 05:59:40 -0500 Assertions            PID 77(powerd) Created UserIsActive "com.apple.powermanagement.wakeschedule" 00:00:00  id:0x0x900009faf [System: PrevIdle PrevDisp DeclUser kDisp]
2019-11-07 05:59:41 -0500 Assertions            PID 77(powerd) TimedOut UserIsActive "com.apple.powermanagement.wakeschedule" 00:00:02  id:0x0x900009fac [System: PrevIdle PrevDisp DeclUser kDisp]
2019-11-07 05:59:41 -0500 Assertions            PID 77(powerd) TimedOut UserIsActive "com.apple.powermanagement.wakeschedule" 00:00:01  id:0x0x900009faf [System: PrevIdle PrevDisp DeclUser kDisp]

I don't understand what those log entries mean and searching for the terms in them hasn't yielded anything revealing so far.

In the Energy Saver system preferences, I have the following options enabled:

  • Prevent Computer from sleeping automatically when the display is off
  • Wake for network access
  • Enable Power Nap

In the "Schedule" settings the "Start up or wake" setting is disabled.

Why is my computer waking up? And what can I do to stop it?

  • In Terminal, type pmset -g sched, and comment with the results. There will be no result if there is nothing scheduled. If there is something scheduled it may read Repeating power events: wakepoweron at 5:59AM every day. – IconDaemon Nov 9 '19 at 18:04
  • Sure enough, one event: wake at 11/10/19 05:59:40 by 'com.bombich.ccchelper' Looks like Carbon Copy Cloner is the culprit. – GuyGizmo Nov 9 '19 at 18:05
  • @IconDaemon If you post your tip of using pmset -g sched as an answer I'll mark it as accepted. – GuyGizmo Nov 9 '19 at 18:15
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You should use the Terminal command pmset -g sched to determine if there is any repeated wake from sleep scheduled or some other app/system service which has set a wake event.

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