Waking from sleep

I recently read about some people having trouble waking up their Mac, in this case I'm on an MBP, and saw something said about turning off "safe sleep" solving the problem. I can't find any such setting and wonder if someone can shed more light on it or have other tips. Thx,

Richard
10.4.5
Sent using the Microsoft Entourage 2004 for Mac Test Drive.