Macbook freezes upon wakeup after extended sleep

I have been having an issue with my Macbook that just started occurring within the last month or so. I am unable to relate it to any specific software update that I might have done, but in my trouble-shooting I have a strong hunch that it is a preference issue.
The issue happens when the Macbook is left in a state of sleep mode for a length of time greater than 1 hour, this is especially true when closing the clamshell to put the computer to sleep. Some things I can do to extend this time are listed farther below.
When returning to the computer it seems to be in the proper sleep mode. The light is pulsing as it always has. The issue is upon waking, opening the clamshell the screen flickers and then freezes up leaving the screen black and the system completely unresponsive. This is not a failed back light that does not come on, absolutely nothing works in this frozen state, caps lock light does not work, volume does not work, pressing the power button and return does not allow it to restart. Absolutely nothing works.
At this point I have two options, hard reset or just waiting it out. The hard reset option does not always work, but waiting it out always does. It can take about 30 - 45 minutes to come back to life. There is a serious drain on the battery in this frozen state if it is not plugged in.
Some things that I have noticed in trouble shooting this include: If I use the Apple menu or keyboard commands to put the system to sleep before closing the clamshell I can come back to it anytime within the day and it will work normally. If I extend that time longer, (like over night for example) I have a 70% chance it will wake normally and 30% chance it won’t. Leaving it in sleep mode longer than just overnight will always result in the freeze occurring.
The freezing occurs even when Airport is turned off prior to putting the computer to sleep using the Apple menu or keyboard commands. My hunch is that it is a preference issue that becomes corrupted somehow over time because the issue develops in the extended sleep. If I close the clamshell and open it again 10 minutes later it works normally 1 hour later and it is frozen. This freeze is not application specific, it can happen with or without any application running.
Some other things I have tried are deactivate and reactivating the Airport in Network Preferences (I also did this with the Ethernet even though I only use Airport).
I’ve Repaired all permissions. I’ve replaced the com.apple.AutoWake.plist.
I've reset PRAM and SMC.
Any suggestions would be appreciated.
This Macbook is 2.16 GHz, 2 GB RAM running OS 10.6.5.

An update to my earlier posting, doing some trial and error I have discovered that after removing all of my HP printer/scanner drivers and related software (which I was having less than an optimal experience with anyway), my freezing issue has been reduced from more than 1 hour down to 10 minutes. I'm definitely getting closer to the problem but haven't found the exact software preference causing the issue yet.

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