The statement "not completely paved" is a slight understatement. At least it feels like the main part of the route is gravel. The rest are old, more or less worn tar or concrete paths. Although it tends to go downhill, there are also inclines. Still: it's definitely fun. It goes through fields and forests.
The cycle path is only recommended if the ground is dry, as in the wooded part the path is broken up by the forest vehicles and is more like a mud fight.
Unfortunately, this is not about sleeping. The new Bettenradweg takes its name from an old name for the forest district "Betten". A trade route ran along this ridge between the valleys of the Wolfsbach and Bleichenbach streams: the "Bettenstraße", which was used in the Middle Ages and probably even in pre-Christian times.
A new cycle path has now been opened here, which goes through this area. It goes from Ober-Seemen to Glauburg-Stockheim and is about 23 km long.
The downside is that it's not fully paved, so it's unsuitable for racing bikes. The signage is also (still) in need of improvement. I didn't see the additional sign "Bettenradweg" very often. At the moment I would still lean towards the bicycle navigation system if you want to go this route.