It is a sign that there is an event that upsets, stresses and causes distress in the subconscious mind, that one is believed to be in an unresolved situation, that the person loses hope and starts to look pessimistic about everything. People who experience sadness are often sad in their real life and feel unhappy all the time. It is also a sign that people who think that things are not going well, that they are unlucky and that make this situation an obsession are in a melancholic psychology.
It means that the dreamer, who is under the influence of everyone, cannot find suitable environments to express his thoughts, that he feels stuck all the time and that he has an introverted personality because he thinks that he is not cared. Sadness is also seen as a symbol of a melancholic psychology.