Screen turns on at any movement through sensor

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Since today my screen goes on when any movement over the sensor on the top of the phone.

You see the little sensor at the top next to the N of Sony EricssoN? Well, if i go with my hand an inch above over it my screen turns on! So in my pocket the screen is constantly on obviously and this drains my battery very fast as the screen is the most heavy battery drainer of your phone.

My wife has the same phone and she doesn't have this problem.
Does anyone have any idea how I can switch this off?????
this is very annoying!

Cheers,
Arnold

Odd, i dont have this issue.... how does one turn on the prox senser anyway?

turning off is now more my concern I have no idea what happened. Of course I play lately a lot with it since I rooted it, so I might have changed something which effect on this sensor...