I have a computer that wakes from sleep when the mouse gets jiggled. The mouse is so sensitive that it gets jiggled when someone walks across the floor.
I went into Device Manager and I cleared the checkbox for "Allow this device to wake up the PC" on the mouse device, and that didn't help.
It is a Logitech wireless mouse, and it added a second keyboard device, in addition to the "HID-compliant mouse" device. You have to disable wake for both the mouse device and the faux-keyboard device.