Why does slowing down execution prevent OOM errors?

I've run into two different situations where OOM errors went away when I slowed down the code. Right now I have a single threaded application that reformats batches of images. If I change
Thread.sleep(400);
to
Thread.sleep(300);
then the application throws OutOfMemoryErrors.
Does anyone have experience with this or ideas about how to solve it? I'm using the 1.4.2_03 VM with the default GC options.

To avoid OOM errors. The original code had no sleeps
and threw OOM errors. I added debug messages to
diagnose the problem and the OOM errors went away. I
replaced the debug messages with a single sleep to see
if it was a speed issue.I wouldn't expect to see this behavior in a single-threaded app. That's why I'm wondering if there isn't more going on.
It would also help to know what is happening afterevery nap.
After each nap, the thread reads data from a database,
reads a JPEG image from a file, translates the image
to TIFF format and writes the image and other data to
a file.When you call it 'the thread' it impies to me that it is separate from your application thread. Is it? Is there a GUI? What DB are you you using? What driver? Are you closing your DB connections? Are you closing your IO streams?

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