In my case, I experienced vibrations and buzzing sounds in the following situations:
Astral Projection: When attempting astral projection, I would become unconscious and then realize I was awake, feeling vibrations throughout my body. These vibrations disappeared once I lifted my body out of itself. However, the experience was not extraordinary, appearing blurry and black-and-white like a dream.
Hyperventilation: Using breathing techniques such as holotropic or Wim Hoff breathing for extended periods, often more than a few dozen minutes, resulted in hearing a buzzing sound and feeling strong vibrations. Despite doing this frequently for several hours at a time, nothing significant happened beyond the sound and vibrations. A slightly unusual effect was muscle paralysis, which made it difficult to move and dulled my senses.
Successful Meditation: Occasionally, during successful meditation, I heard vibrations and buzzing sounds. The intensity varied, sometimes faint like background noise and other times loud like an airplane taking off. Despite the sounds and vibrations, nothing special occurred beyond this.
Emotional Uplift: When emotionally uplifted, such as when reading spiritual books or engaging in activities I enjoy, I often felt joy, happiness, and pleasure. These strong emotions sometimes led to experiencing vibrations, but nothing extraordinary happened beyond that.
Purification: During moments of intense fear, terror, anxiety, mental confusion, anger, hatred, and sadness, I heard vibrations and buzzing sounds. These noises accompanied a deep meditation state within minutes, along with a sense of bodily expansion and deepened consciousness. However, these strong emotions persisted.
Affirmations: Repeating affirmations like "I love" almost all day for several days led to experiencing vibrations. During this time, I felt a strong pressure and physical fatigue, as if something external was pressing on me. This sensation disappeared when I stopped affirming.
When I first encountered these experiences, I was surprised and intrigued. However, as I grew accustomed to them, they lost their novelty. The buzzing sounds and vibrations were just that—sounds and vibrations—without any profound experiences attached. Initially, I was excited and anticipated something different, but over time, I became tired and bored.