You can try the sleep kernel, go to irc.osx86.hu #10.5 room.

What´s your sleep mode?

open a terminal and type

sudo -s
(password)

pmset -g | grep hibernatemode (with this command you´ll know your sleep mode (0-1-3-5-7)

(if you have in your bios S3 type in terminal)

pmset -a hibernatemode 3