I recently bought a 2012 MBA w/8gb Ram and upgraded it to Mountain Lion. While Mountain Lion has been running normally (besides slightly worse battery life I believe), the one issue I have found is that if I let it sleep for a long period of time (overnight), then when I open the screen the next morning the display turns on, but there is a 3 second delay before any movement is registered on the trackpad. I hadn't used this much pre-Mountain Lion (since I upgraded very soon after it arrived), but I don't remember this delay. Does anyone else have this issue/a fix, or is it likely just a bug with the initial release that should be fixed in the next update?