Power Button changed in Mavericks?

After upgrading to Mavericks (and installing a whole bunch of updates), I wanted to restart my computer just in case. I pressed the power button once, and my MacBook Pro went instantly to sleep. Confused, I pressed it again, and it woke up. I tried this a few other times again, and eventually I held down the power button, revealing the familiar "Restart, Sleep, Cancel, and Shut Down" buttons. Has this happened to anyone else?