Yea, looks like your keyboard and mouse don't support disabling wakeup.
You can find a USB Keyboard and mouse that aren't very expensive, especially if you keep an eye on Sales.

You can look at the options available for your Network adapter in Device Manager.
See if you can disable allow waking from sleep.
You may also want to look in BIOS setup for a setting like "Wake on LAN".
It's probably in a Power Management section of the BIOS settings.
If you do have Wake on LAN enabled, disable it.

The Network adapter may be what is causing your PC to wakeup in the middle of the night.