Just had Sleep mode not working right, but I seemed to have fixed that, did Avast repair, and first time in 3 days last night, sleep mode actually went to sleep autoly lol.
Same for my Vista 32bit machine upstairs, and XP laptop.
Not sure what the exact issue was with Sleep mode and Avast, but it seems fixed now
Not sure if related either to aswTdi issues in Event viewer on Windows 8 PC at all either