Windows 10 wakes itself up to install updates

Run the Command from an elevated command prompt; see what it tells you.

C:\>powercfg -lastwake

Example from my laptop:

 powercfg -lastwake
   Wake History Count - 1
   Wake History [0]
     Wake Source Count - 1
     Wake Source [0]
     Type: Device
     Instance Path: PCI\VEN_8086&DEV_8C31&SUBSYS_201F1043&REV_05\3&11583659&0&A0
     Friendly Name: Intel(R) USB 3.0 eXtensible Host Controller - 1.0 (Microsoft)
     Description: USB xHCI Compliant Host Controller
     Manufacturer: Generic USB xHCI Host Controller

After thinking about it it occured to me that my Logitech universal dongle was the culprit as it was a HID complaint mouse... Simply disable that in Power management and you should be golden.

I had this issue too, even after disabling the wake timers in Power Options, Windows kept waking up to install updates. I solved this by tweaking a Group Policy:

Computer Configuration 
  > Administrative Templates
    > Windows Components 
      > Windows Update
         > Enable Windows Update Power Management: set to Disable

Note: does anyone know how to automate this setting using PowerShell?