I have installed Windows 8 (64-bit) on an SSD by cloning from a HDD. Whilst sleep worked exactly as expected when the system was running from the HDD, only waking when I clicked the mouse or pressed the "Enter" key, my PC will now no-longer stay asleep for more than about 10 minutes after being "put to bed". I have painstakingly been through every item in the Task Scheduler to ensure nothing is set to "wake the PC up" in order to run; and I have ensured that no devices are set to wake up the system; in addition I have ensured that sleep and hybrid sleep are enabled in the power setup. "Fastboot" is disabled. The only thing I changed was shifting my system image from an HDD to an SSD. What else could be triggering the re-awakening?