XPS Gen4 Restarts Automatically

Interesting point.  It has happened 4 nights in a row though
so I'm not sure if this is it.  I'm changing to see if it is the
problem though.

not sure if this will help but

windows xp will sometimes be set to automatically restart upon a system failure (STOP errors mostly)

a way u can check this is to right click on my computer an go into properties (so the system properties window)

click on the advanced tab, an under startup and recovery click the settings button, on this page you'll notice under System Failure a option that says automatically restart with a checkbox next to it, try unchecking it (that is if its checked) applying and restarting the computer and let the computer sit overnight or whatnot again, in the morning when you get to your computer see if its at a blue screen or not with a stop error.

if you get to your computer in the morning and its not at a blue screen then its not this kind of error, but if its a blue screen then u gotta troubleshoot the STOP error

 forgot u could also check your BIOS or system setup utility, sometimes the bios's have an option to automatically power the system on

to get to the bios tap F12 on the system as its powering up in the system setup look thru the list and check to see if that option is enabled or not

Here's how I kept an eye on the night shift cleanup crew:  I put in a cheapo USB cam, downloaded a shareware utility like supervisioncam.com has, and set it to trigger at about 30% movement threshold.  It comes on automatically at quitting time, turns off next morning, and is set to email a series of shots to my home account.

Actually, one day I received shots of firefighters opening the door to my office, so I went in to work.  They had left after what was a false alarm, leaving the door to the server room wide open.  But best of all, the janitors stay clear of my office because they hate that camera.