Freezing Around Logging Off or Sleeping

I have noticed that occasionally (probably on average around once every one to two weeks) my computer will freeze around one of the two following events: logging off or the computer going to sleep.
When logging off, my computer will sometimes freeze after I select log off from the Apple menu. This is characterized by the mouse pointer not moving (maybe this is different than the computer freezing). I can even log back in, but the mouse pointer still doesn't move. The only way I have been able to resolve this is by holding the power button down to manually shut the computer down.
When going to sleep automatically, the computer also sometimes freezes. In this case the computer goes into a state like when the computer screen sleeps, but the entire computer doesn't sleep (the white light comes on, but doesn't pulse). The fan begins spinning significantly faster. However, I can't wake the computer. The only way I have been able to resolve this is again by manually shutting the computer down.
It doesn't seem like these two occurences would be related at all. Also, short of an occasional 'unexpected quit' in an application, my computer seems to function properly, and the freezing incidences are relatively infrequent as I mentioned.
Any ideas as to why this might be happening or how to fix the situation would be welcomed.
Thanks, Joshua213

Hi Joshua213!
How much space is available on the Hard Drive?
Have you run Repair Disk?
Also you should perform system maintenance procedures.
You will find excellent tips in these links.
Mac OS X 10.3/10.4: System Maintenance, authored by Gulliver
Maintaining Mac OS X, authored by Dr Smoke
Running Mac OS X Maintenance Scripts, authored by Dr Smoke
ali b

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