Power button acting weird...

So, I don't know if its just me but in the past week or so (don't recall if this was happening before most recent updates), I've noticed that my power button doesn't do ANYthing while the computer's up and running. Didnt it used to prompt up for if I want to shut it down, sleep, etc? It still works to boot up the computer and to wake it from sleep and such, but when the compy's up, it doesn't work.
Thoughts, anyone?

A quick press of the power button on my MBP (on 10.5.6), while it's awake, still gives the Restart/Sleep/Shut Down dialog box.
Perhaps try a PRAM and/or SMC reset:
http://support.apple.com/kb/HT1379
http://support.apple.com/kb/HT1411

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