My previous PC would wake up every night around 1am and I could never figure out why. I disabled every single wake timer, all kinds of wake permissions on devices, yet it would always wake up in the middle of the night. The power event in pc management only said "woken by: unknown source".
I do some support work for a friend and his kid's school laptops.
All Lenovo/Win 10.
He complained about the same thing, in this case on laptops that were completely shutdown the night before. In the end we tracked it down to the Lenovo Vantage service.
I assume it was powering on the laptop to check for updates but I could find no log or record of it doing so. But, once we removed that software the issue went away completely.
Anecdotal I know and I even told him it could be something else, that removing the software may have changed something related but not from Lenovo, etc. But in the end, a few weeks later that is, he confirmed that since we did that, they did not have the problem again.
