Hi
I thought I posted a response recently but I can't find it.
My computer is an Asus. Since 1903, it won't sleep on it's own. I can put it to sleep by using the hotkey short cut on my keyboard or by closing the lid. I also make sure my wireless mouse is turned off (bottom of the mouse).
With regards to waking up, my computer seemed to go into hibernation rather than sleep after 2 hours...on its own. I just push the start button and the computer starts where I left off.
With this in mind, everything worked until September when the computer started to wake up 10 minutes later. I took the computer to Staples and worked with the guy there. He said that under power options and advanced settings and sleep, change allow wake timers to "important wake timers only." This prevented the computer from waking up.
So now my computer goes to sleep either by shutting the lid or by using the hot keys. After 2-3 hours it seems to hibernate and I turn it back on using the power button.