I would also go into your BIOS and turn off anything which allows your
computer to be turned on, which you aren't in control of. Many BIOS have a
feature that turns on the computer at a specific time. I use the feature to
turn on my computer overnight to do downloads during a time that doesn't
count against my daily allowed bandwidth.
Check your user manual to see how to get into the BIOS and see what is
allowed to turn on your computer.