Vista Hibernates Again After Resuming from Hibernation

I've noticed that my new notebook (running Vista) has been hibernating very soon after I resume it from hibernation. I'll often start/resume the notebook and then turn my attention away to do something else while it's resuming, only to find that it's hibernating again when I turn back. After searching Google for much longer than should have been necessary, I found a Microsoft knowledge base article that addresses the issue.

The KB article deals primarily with XP, which re-hibernates after 5 minutes of inactivity after resuming from hibernation. I read that much of the article and then closed the tab and resumed searching since I'm not running XP, and I'm seeing this occur after much less than 5 minutes. If I had read the whole article the first time, I would have found out (sooner) that Vista behaves similarly, after only two minutes of hibernation. Aha.

I'm looking for a way to adjust this timeout via a registry key or similar setting, if it's possible at all. It may be that the only "solution" is to pay more attention when I'm resuming from hibernation. So much for multi-tasking.