I just installed Win7 in my Mini 9 with the later BIOS and Win 7 version 7100, after turning hibernation off, the never want to wake up from sleep got fixed.
in Curios post i did this
Description: You may free up 1GB of space on the SSD
if you have 1GB of memory, 2GB of space if you have 2GB memory. You will lose the hibernation feature which allows the equivalent of quick boots and shutdowns.
Instructions: Start Menu -> Type cmd -> Right-Click the cmd Icon -> Run as Administrator -> Type powercfg -h off -> Type exit
after that it worked, i know he wrote it for saving space but it did work for my wake up from sleep problem.