Time Machine Fills up my startup Disk

Hi all. I'm running Time Machine on 10.5.5. My startup disk has around 80 gigs free (out of 300 total). Problem: when I've been away from the computer for a while (overnight or a couple of hours) I will wake it up from sleep and see the warning that my startup disk is almost full. In fact, it will report 0k free. Then, as I begin to close apps and windows, all the space comes back. Sometimes all at once, sometimes 3 gigs first followed by the rest.
I've tracked it down to Time Machine. If I have Time Machine turned off, this weirdness doesn't happen. When I turn it back on, it does. I do have a couple of really large virtual machines on the startup drive, but I have them excluded from Time Machine, if that has any bearing. Has anyone seen this before, or know of a fix?

You need to see what it is exactly that is taking up the HD space.
Running WhatSize or find in a terminal would help.
The console logs might also be useful, especially those related to TM.
You say you let it sleep when this happens. It might be a hibernation file.
The hibernate file(s) are located in
/var/vm
and it is named sleepimage
mine is:
-rw------T 1 root wheel 4294967296 Dec 13 18:02 sleepimage
it is about the same size as RAM
However, I have read here that some have noticed several of these files.
Maybe this is unrelated to your problem, I don't really know.
Check out this article
http://www.macworld.com/article/53471/2006/10/sleepmode.html

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