Q. My machine was in sleep mode and I stepped away. When I came back to it, the machine was awake. How can I tell what caused the machine to wake?

A. I had a similar problem, where I put my machine in sleep mode and came back to see it wide awake, and I had no clue why.

The easiest way to check why a machine woke from sleep is to run the command

powercfg -lastwake

This will show the reason why the machine exited sleep state.

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