Hi, i believe i may have a solution for you.
I had the exact same issue with my 15" Unibody MBP (Late 2008). I tried EVERYTHING I found online, and I mean everything to no avail. Resetting pram, nvram, smu, deleting system files, re-installing snow leopard, safe boot, different hard drive, etc. Etc. Nothing worked.
I had given up, as I simply couldn't find anything else on the web that I hadn't tried already. Then it hit me, if the screen is fully lit up, everything is working perfect UNTIL it logs into and *immediately* goes to sleep, AND won't wake from sleep, then it's probably one isolated problem with sleep functionality alone. And it was. :)
1) open the mbp up and look at the logic board
2) look at the IR/Sleep ribbon cable. (Use iFixit reference guide, here's the image
3) Make sure it's plugged in ALL the way. (mine was very loose, nearly unplugged completely)
4) Once the cable is in place, simply reboot :)
This fixed it, so far, seems permanent!
Let me know if it works for you.
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