I have got the problem, that I schnarche while i sleep. That is not
really a pleasure for my girlfriend. So I´m seeking for a Treatment in
germany to solve this problem. It should be something wit a clinic
operation.

There are many possible causes and you will require examination to
eliminate some of the possibilities.

Supposedly sleeping on your side can solve some problems; if one side
doesn't work, try the other.

Schlafen Sie gut!

This doesn´t work, I tried that. I heard from some kind of Laser
Treatment, that can help.

Not to be indelicate, but are you overweight (even a little)?  Losing
weight is the number one recommended cure for snoring.  Topical
sprays, lozenges, pillows--none of that stuff works.  If you are not
overweight and you still snore, you should consult a good ear nose and
throat doctor to see if you have adenoid/sinus/tonsil problems that
can be corrected with surgery.

BTW, I had a friend who was not overweight who snored and he had
elective surgery to widen his throat passages and tighten the soft
palate (which is what causes snoring).  It cured it, but it was very
expensive and painful.

How about this website (in German, but including FAQ in English):

http://www.medica-muelheim.de/schnarchen.htm

Snoring is a real medical problem.  Snoring can cause apnea which can
lead to high blood pressure and cardiac issues.  There is a very
simple device that is very effective in eliminating snoring.  It is a
C-PAP machine.  Ask your doctor about this device.  It can be
prescribed by the doctor which means that your insurance may cover the
rental fee.

Overweight is one of the leading causes of snoring - especially if the
bulk of your weight is located in your abdominal area.  Losing weight
and getting daily routine exercise like a brisk 30 minute walk will
give you the relief you seek as well.  It is the ideal solution to
snoring as it will also increase your energy levels, decrease your
cholesteral, improve and promote a healthy cardio/vascular system and
more.

BTW snoring will also cause you to be drowsy during day because you
are not getting a proper sleep at night.  There is real danger in that
as well because you can fall asleep while driving.

Good luck and God bless.