I had a light spill on the keyboard a while ago, everything seems to be working fine, apart form some sticky keys, even...

I actually ended up completely taking the computer apart and replacing the keyboard and the 50 or so tiny screws about 8 times due to other malfunctioning keyboards... Ended up with one that finally worked. It fixed the sleep problem as well, to anyone reading this with the insomniac Mac problem. Try replacing the keyboard because certain keys might be acting up waking the computer, like in my case. Thanks everyone for all your help.