The screen on my mac book air 2011 goes dull  when it shouldn't be. Any tips?

Screen on macbook air 2011 goes quite dull even when I'm operating it. It is as if the machine is going to sleep although it shouldn't be doing so.
It is a little slow to rouse from this dulled state.
Unplugging and re-plugging power socket appears to remedy this problem But it shouldn't really be happening should it? Any ideas?

Does it hapen when your rest your fingers on the trackpad? If so it can be a state of zoom....
Try different trckpad settings (Apple, system settings, trachpad)
Hope that helps

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