Longstanding problem with Sleep causing Bomb

Hello,
iMac Intel Core 2 Duo running X v10.4.11
all updates applied whenever system says they're available
no peripherals
The problem is a simple one to describe: if I put the iMac to sleep manually all is well. If I leave the iMac to its own devices, it bombs out and when I come back to it, it's sitting there at the log-in screen waiting for me.
I'm a careful user. I rarely leave applications running but hidden, preferring instead to Quit them. (Old habit from pre-X days.) The exceptions are Mail and Firefox, which are always on but hidden when not in use.
Settings from relevant Prefs:
Energy Saver - Never and never (I've tried other settings)
Screen Saver - 15 minutes (I've tried it with this set to Never as well)
As you can see, the system should not be going to sleep at all. But whatever it's doing is causing a crash. And as mentioned above, I have tried other settings in the Energy Saver control panel with exactly the same result.
Can you suggest other info that might be helpful -- a crash log maybe? Or other options to try to isolate the problem?
TIA
Rob

Fascinating links you offered there!
I ran the scripts (mentioned in the first link) manually, using terminal. Here's some of the output...
blk-215-67-54:~ me$ ls -al /var/log/*.out
-rw-r--r-- 1 root wheel 288534 May 17 10:15 /var/log/daily.out
-rw-r--r-- 1 root wheel 612 Jun 11 2007 /var/log/monthly.out
-rw-r--r-- 1 root wheel 4040 Apr 10 10:57 /var/log/weekly.out
Which shows that 10.4.11 is trying to do the right thing, but was getting interrupted too often, especially with the monthly logs. When I ran the scripts the process took almost 5 minutes for all three. I'll try to remember to do that about weekly.
A also checked for disk fragmentation using a utility mentioned in the second link. I don't have to worry about that -- yet. And another utility reported that I have lots of RAM available, most of the time. I'd feel a lot more comfortable about replacing my half-gig chip with a ful gig if I could do anything with the half-gig one, but I guess they'rre worth nothing. Amazing!
Thanks again for your help and suggestions.
Rob

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