The MBA has no moving parts, no characteristic hard drive whir, no pulsating power button and no breathing light. How then, does one tell if the laptop is sleeping or just the display?

To make it worse, Display wake on trackpad swipe has been removed from Lion so swiping at the trackpad will not wake up the screen in either case (Display sleep or Laptop sleep).

Is this a desirable thing btw (like is Apple trying to blur the line between the two forms of sleep because the MBA has an SSD and wakes quickly anyway?)

Thing is, while swiping doesn't work, tapping or double tapping (as opposed to a full press/click on the trackpad) *does* seem to wake up the MBA sometime. I just can't tell whether its waking from Display sleep or Full sleep.