Since attaining my PPL license with night qualifications last year, I'm yet to fly during the night. Now, I am wondering if I've to fly during the night to maintain the night rating. I've already more than the 25 hours needed to stay current and maintain the PPL requirements. My concern is though, what will happen if by the next scheduled evaluation of my license by CAA I don't fly according to FAR 61.57??

The issue is, what do I have to do to maintain my PPL w/NQ?
Btw, I'm based in Germany but hold a JAA PPL w/NQ issued by CAA.
WP