As soon as I got my new Dell laptop, I set it up to my likings. One of the things I did, is setting what closing the lid does. In my case, I’ve set it up to hibernate. But strange as it is, I saw that when I get back at morning or after a few hours, the laptop fan is working fast, and the laptop seems to be awaken.
I started investigating more. I suspected that it’s likely a power setting rather than a failure or a bug. I was right. In windows 7, there’s a feature called wake timers which are enabled by default. Even if you put the computer to sleep or hibernation, it will wake up by timed events such as Windows updates, etc. So, disabling this feature is recommended. You don’t need your laptop to wake up and work for 2 weeks with lid closed while you’re on vacation in Hawaii.
To disable wake timers go to Control panel > Power options > Change plan settings (on the right next to the checked plan) > Change advanced power settings
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