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#21
Just in case this is helpful in any way to the problem that you have having, here is the sledgehammer approach that I ended up using on Windows Vista to resolve the problem where my laptop would not stay asleep or hibernate for more than 2 minutes. This really is overkill and should only be used as a last resort. (but in my case, my laptop kept waking up in the bag and I thought that it was going to cook itself.)
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Power\PowerSettings\238C9FA8-0AAD-41ED-83F4-97BE242C8F20\BD3B718A-0680-4D9D-8AB2-E1D2B4AC806D
Go to DefaultPowerSchemeValues
Go to each subfolder ( i had 3 subfolders)
Find ACSettingIndex and change value to 0
Find DCSettingIndex and change value to 0