This dream may reflect feelings of betrayal and loss in your waking life. The act of studying outside at night suggests a sense of vulnerability and being exposed to danger. The stranger who pepper sprays you represents a sudden and unexpected attack or betrayal from someone you thought was friendly. This could be a metaphor for a recent event or situation where you were blindsided by someone you trusted. The fact that the stranger then comes back and slits your throat and vocal chords may symbolize a fear of losing your voice or ability to speak up for yourself in the face of this betrayal. The inability to call for help or get the attention of your parents could represent a feeling of being abandoned or unsupported in your time of need. The dream may be urging you to confront these feelings of betrayal and loss and find ways to regain your voice and sense of security.