Sleep problems (even after firmware update)

Hello
Previously I was having problems where I would put my Macbook to sleep only to find it an hour later in my bag blazing hot with the fan working overtime.
The recent firmware update seems to have fixed that problem but it's been replaced by another. What happens now is when I get home and retrieve the Macbook from my bag and open the lid the hard disk makes it's familiar waking up sound but the screen doesn't come back on - and I'm not really sure if the computer has woken up or not - sounds like things are happening inside the metal but no beeps or burps when I randomly press keys / try to make things happen.
In the end I'm forced to hold down the start up button and force a shut down.
Anyone else having this? This doesn't seem to happen when I wake from sleep at any other time than when I take the computer from work to home which makes me think it's something to do with maybe my Bluetooth mouse or wireless network?
This is really frustrating and I'm sure forcing a shut down isn't doing my HD any favors.
Can anyone help?
Cheers
Dom

I forgot to mention, DenverEagle, some more details.
My iMac would do the same thing: if it went to sleep, it either just shut down, or restarted, instead. If I turned off sleep, all was OK (for awhile. Eventually it had an episode where I turned it off and it would not start back up. Eventually, it did start back up [after about a day's rest]. That was when I took it in).
So it might be the same problem I had.
The software steps I was told to do, in attempt to resolve it, were:
1) Delete my power settings preferences file, and;
2) Reset the SMU, and;
3) Reset the PRAM/NVRAM.
None helped, but they're easy, so you might try them. I don't think I they have any nasty side effects, but buyer beware.
I'm a little hazy on #1, and I can't find the tip online, but I think it just involved deleting the file:
/Library/Preferences/SystemConfiguration/com.apple.PowerManagement.plist
Number 2 is outlined here:
http://docs.info.apple.com/article.html?artnum=301733
Number 3 is outlined here:
http://docs.info.apple.com/article.html?artnum=2238
I took my iMac to the Cherry Creek Apple store, and they fixed it really fast (it was 4 days, including a weekend, IIRC).
iMac G5 17" 1.6 GHz Rev. A   Mac OS X (10.4.8)   1 GB Ram

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