This dream may reflect feelings of being watched or monitored in your waking life. The apartment symbolizes your personal space and the intruder represents a sense of invasion or violation. The fact that he jumps onto your balcony and tries to open your window suggests a lack of boundaries or a feeling of vulnerability. The number 11 may symbolize a sense of urgency or a deadline approaching. The child intruder could represent a younger, more vulnerable aspect of yourself that you are trying to protect. The knife may symbolize your ability to defend yourself or take control of a situation. The act of slitting the intruder’s throat could represent a desire to eliminate this sense of fear or vulnerability. However, the fact that you have to do it multiple times suggests that this issue may require more effort or attention. This dream may be a reflection of your subconscious fears and a reminder to set boundaries and protect yourself in your waking life.