Windows 7 – Laptop Turns On Spontaneously from Sleep State

My first thought is to check the BIOS settings for any kind of auto on setting. Most have a way of turning themselves on at a certain time of day, this may have been enabled. You could also go into BIOS and set defaults and reboot to see if the alleviates the problem as well.

As for less likely possibilities, like you said it could be a short in any of the circuits for power or reset switches, but also something in the keyboard as well since tapping a key on the keyboard will also wake up a sleeping computer.

The last thing that comes to mind is some really funky power issues. Spikes or sags in power can do some really weird stuff to computer equipment.

At the risk of looking stupid, I found the following:

I also had the same problem. I never shut down my laptop, I always put it into sleep mode, and it would wake up unexpectedly in the middle of the night. I discovered that this "S4 Doze to Hibernate" event is not a bug, it's a feature. Go to power advanced settings and change "hibernate after" under "sleep" drop down menu:

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Choose how long you want to wait before going to hibernate from sleep mode. I set mine to 1440 minutes (24 hours) which is enough for staying overnight.

By the way, also check you don't have anything under "allow wake timers".

I don't see that you say you've tried this, so if I missed you pointing it out, I apologize for wasting your time.