Soundproofing - noises from the bedroom

Partition wall with soundproof drywall including soundproof filling material is really good. SK1 (or better) doors with matching frames and drop seals in both rooms.

Would anything still be necessary regarding the ceiling (i.e., upwards)?

It depends on the existing construction.

It depends on the existing construction.

As I said... the ceiling is about 2.60 meters high. Above it, the wooden roof structure. On top, the vapor barrier and above that a layer of insulation wool (cold roof). Below, drywall on aluminum rails.

Yes, but the ceiling is not continuous. Rather, it is interrupted by the walls, and insulation is then on top of that. Thus, this should be sufficient. Otherwise, if necessary, screw on one or more layers of sound-insulating drywall.

Turn on the TV and go up to the attic. Then just listen to what comes through.

Great! Thank you very much for your tips!