Das Sandmännchen is the West German version of the East German show Unser Sandmännchen. Apparently, the Eastern version was more popular, so the Western version is no longer produced. But I can't verify that. Citation needed.
I find little info about the Western version: Who produced it? How long did it run? How many episodes were made? And why was it cancelled?
Here are the episodes I've found online. Besides the year, which I cannot verify, exact air dates are hard to come by.
This one has the RBB logo. RBB currently produces the Eastern version, which survived post-reunification and airs to this day.
I hazard to guess Ivor Wood is behind the stop motion models?
I don't think so. I cannot find anything online linking him to the show.
Sharing a reply I received to one of the videos I shared above. The uploader is Fred Foster Father for Forgotten Films :
Hi Emir, in fact this is the only "Sandmännchen"-episode I have in my 16mm film collection. I replaced the missing German conversation between the clown and the duck with some fitting theremin music. How comes that you are interested in this old fashioned German TV series? I can give you some links that will trace you to more information about this long running children's program: