I began practicing meditation and yoga since high school years. I meditated half an hour every morning after getting up. I meditated every night before going to sleep. Why did I do this? Well, at that age, I believed meditation can bring me super powers. For example, to improve my learning capability and grades. Did it work? No, it didn't. At the beginning, there's no change in my physical and mental conditions.
After half a year of serious meditation practice, some strange things happened. One night, I was awaken by a strange sensation in my body. I felt there was a strong electric current passing through my body, centered around my spine. My whole body was vibrating. Then I felt I was teleported to some strange place, where people walked around on some street, caring about their own business. Then instantly, I was back to normal, in my bedroom. No vibration, no nothing. I was awake, in my bed, confused, scared.