Two nights ago, while I was trying to have an astral projection experience, I suddenly felt something very unusual. It felt as if someone had lightly tapped the center of my forehead with the tip of their finger, right where the so-called "third eye" is located. That area started feeling concentrated and heavy.
Shortly afterward, my entire body became numb. I was completely conscious and awake the whole time, and I could still move. During the numbness, I think I felt as if my body was moving from side to side or vibrating internally. The sensation lasted less than two minutes, although I don't remember the exact duration. Eventually, everything returned to normal.
The strange thing is that the exact same experience happened again the following night while I was attempting astral projection.
What do you think could be causing this?