So, the Nemisis or the yin describes the dream when it is being aggressive and the yang describes the dream when it is being unaggressive? I could relate to that! I'll just use the words aggressive and unaggressive to relate to yin and yang.

The dream is aggressive when it has some sort of important matter behind it that requires the dreamers attention. In contrast, when there is no important matter behind the dream, there is no reason for it to be aggressive, so it is unaggressive.

The dream can turn from aggressive to unaggressive if the important matter behind the aggression is resolved. Dreams can also turn from unaggressive to aggressive if an important matter is remembered or otherwise presents itself.

Important matters can be resolved within the dream. Resolving important matters within the dream is certainly worth talking about.

The first step to resolving important matters that cause a dream to be aggressive is identifying what the important matter is. The next step is to resolve the important matter if needed (some seemingly important matters become unimportant upon identifying what they are). It is difficult to describe how to resolve important matters because there are many different possible important matters that probably can't always be resolved in exactly the same way.

The most direct way to identify an important matter within the dream is probably to ask the dream directly what the matter is.