My laptop wakes up in the middle of the night by itself

This is a very strange thing, never happened to me before. I accidentally noticed that my laptop wakes up by itself after I put it to sleep. Not instantly, but after few hours. I hear the fan and see the LEDs, but the screen is off and it doesn't react to any keypresses. After a minute or two it turns off, and the next morning I can get it from sleep as usual. I wonder, what the hell is this? Is it some kind of standard Apple maintenance procedure or I'm being hacked? Maybe my hackintosh is malfunctioning? I have no idea what's going on.

submitted by /u/troorl
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