Hi,
Check your folder system/library/extensions and see if nullcpupowermanagement.kext is installed. If it is then that will be the reason why you have no sleep working. If it is there though don't just remove it, but first make sure that you have installed the patched Appleintelcpupowermanagement.kext from Multibeast (install it using multibeast). HSP friend says that this patched kext works for him with his ivybridge cpu so it should hopefully work for you.
If you are not using a DSDT then you will need to install two kexts to get your audio working. You will need to install the patched AppleHDA.kext for ALC892 and also the HDAenabler.kext for that - again, both from multibeast.
Once these three kexts are installed if all went okay then you should be able to remove the null....kext by dragging it to the trash can and then rebuilding the caches - to rebuild caches I use "Kext Wizard". In kext wizard select "Maintenance" and System/Library/Extensions.
I suggest that you if possible make a backup of your install (clone using Carbon Copy Cloner or similar) before you make the changes though because it is possible that the system might KP (kernel Panic) and leave you with an unbootable install.
Hope this helps and good luck.