Quote from SeaWry
Oh what jolly fun that one is. It does have such, but it is not the most pleasant thing ever.
Ideally, if Windows Update is set to Automatic. An if the bios is set to S3 (I think or better) sleep state then Windows can wake the system up if it has not been used in awhile and check for updates at the daily time set. It is ultimately bios dependent and as well kind of sleep mode, but hibernation wont work as that is different. It also must be AC powered to add to that for it is a requirement.
It is ultimately bios dependent on what sleep state and handling the bios does. By this, if the bios allows the OS to handle ACPI wakeup events or if the bios handles in which probably wont allow this to work as the OS needs control.
Complete rat nest if you want a simple version that I could throw out. Or just to say it's crap.
That was kinda tongue in cheek I know it exists and it always works well for me. There is also a setting to do it during the computers normal maintenance also while the OS defrags automatically.