Dreams like yours can be quite revealing and may reflect your feelings about social situations and personal connections. Here are some interpretations to consider:

1. Social Dynamics: The celebration of your birthday surrounded by people who seem indifferent may indicate feelings of loneliness or a perception that your relationships lack depth or authenticity. It could reflect a desire for more meaningful connections.
2. Sewer Labyrinth: The transition into a sewer labyrinth could symbolize feelings of being trapped or overwhelmed by situations in your life. Sewers often represent hidden emotions or parts of ourselves that we may not want to confront. The maze aspect could suggest confusion or uncertainty in navigating a particular situation.
3. Feeling Watched: The sensation of being watched in your dream might point to feelings of vulnerability or anxiety about how others perceive you. It could also indicate an internal struggle with self-judgment or fear of criticism.
4. Lucid Awareness: Realizing it was a dream but feeling unable to wake up may signify a need for control in your life. It could suggest that there are aspects of your waking life where you feel stuck or unable to change your circumstances.

To gain more clarity, consider reflecting on your current relationships and any feelings of isolation you may be experiencing. It might also be beneficial to explore any areas in your life where you feel trapped or overwhelmed, and think about how you can assert control or seek support.