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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.