Why does my MacBook turn itself on after being shut-down completely?

I've noticed recently that when I get up in the morning my computer is on after I completely shut it down in the evening.  Has someone hacked into my computer?  If so how do I check to find out?

Welcome back to Apple Support Communities.
Check System Preferences, Hardware, Energy Saver, Power Adapter to see if 'Wake for Ethernet network access' is checked.  (MacBook 2,1 with OS X 10.6.7 illustrated below).
If you leave your computer plugged in to Ethernet, and/or AirPort wireless turned on when you shut down, the computer will wake when it receives an incoming Ethernet network signal. Your router or WiFi router sends signals fairly frequently to see if your computer still attached.

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