There is a way to adjust that preference. Please read the following article, it has a nicely detailed set of steps. Nothing to difficult.
http://www.macworld.com/weblogs/macosxhints/2006/10/sleepmode/index.php
Hope that helps
Sopranino
just be careful using the deep sleep option. there are a few things that dont work as you want them to sometimes!!!
for example..
if you have your xp partition set as your startup disk, and put it to sleep not saving your latest english assignment due that morning. and then get to school to hand it in and turn the computer on and realise its starting in WINDOZE you kinda get off it just a tad.