This dream may symbolize feelings of fear and anxiety in your waking life. The new house represents a new phase or change in your life, but the basement door opening and lights cutting off at random times suggest a sense of unpredictability and lack of control. This could be related to a situation or decision that is causing you stress and uncertainty. The jump scares and hallucinations may represent your inner fears and doubts, possibly stemming from past experiences or insecurities. The fact that only your grandmother and one other person can see or feel the same things as you could indicate a need for support and understanding from loved ones. The baby in the object you picked up and dropped could symbolize a new responsibility or project that you feel overwhelmed by. Overall, this dream may be a reflection of your subconscious fears and anxieties, urging you to confront and overcome them in your waking life.