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Long Insomnia
What is it
It's normal for modern Macs to wake when they should be sleeping to perform maintenance, collect your mail or check for Notifications. It is not normal when the computer stays awake for a long period of time.
Causes
There are various apparent causes that can cause long insomnia, Apple Mail, Time Machine, Spotlight, Neural Engine, Photo Analysis, downloading OS updates in the background.
Solutions
Things we've found.
- Quitting Apple Mail
- Disconnecting the external backup hard drive before sleep
- Unselecting "Wake for Maintenance" in the "Sleep Settings" window, if you use a M1 Mac, disabling this option can lead to other itemsOfInterest.
- Unselecting "Wake for Network access" in the "Sleep Settings" window.
- Unselecting "Wake for Watch unlocking" in the "Sleep Settings" window.
- Unselecting "Wake for power source change" in the "Sleep Settings" window.