Hello Charles,
No, it most certainly is not a stupid question!
I do believe that if you have Automatic Updates set to download and install
automatically, at the default time of 3am, then yes, it should do so. I do
know that some people were concerned that their computers appeared to be
'waking mysteriously', only to discover that it was AU at 3am.
Personally, I have Updates set to download and notify, not to automatically
install.
--
Jane, not plain

64 bit enabled :-)
Batteries not included. Braincell on vacation ;-)
MVP Windows Shell/User
"Charles W Davis" <> wrote in message
news:...
> Was this just one of those stupid questions?
> "Charles W Davis" <> wrote in message
> news:%...
>> When a Windows Vista machine is placed in Sleep mode, will Windows Update
>> still occur at its scheduled 3:00 a.m. time?
>>
>> Thanks,
>