I read this forum daily and I have experienced 'none' of the repetitive problems that I see people posting....I've also read a lot of posts where people have 'sleep' problems--I have had none.
So...run a full backup--then try 'system restore' to a time before the problem started--which 'may' solve your problem---if the problem isn't solved, you can restore your system from the backup and you'll be no worse off than you are now.
you could try 'googling' your problem--here's one example: (but I disagree with some of the suggested settings) Windows 7 will not sleep or not sleeping
my settings are as follows:
power plan=high performance
turn off display=never
put computer to sleep=never
Display>turn off display after=never
PCI express>link state power management=off
Power buttons>Power button=shut down
Allow Hybrid sleep=on
allow wake timers=Disable
Hard Disk>turn off hard disk after=never
when I want machine to sleep, I select 'sleep' from start menu--screen goes black--machine runs for about 5 seconds then sleeps--wakes with any key.
BIOS, ACPI advanced power state set to S3