Doesn't mescaline do this?
Autonomous Sensory Meridian Response (ASMR)
I've had this experience from time to time since my teens early 20's. When I first noticed it I went to the doctor and they had no idea what it was. It used to freak me out.
Sleep paralysis used to do the same thing to me. I never thought it was anything other than physiological. When I finally understood what it was I felt much better.
Thanks for the info Simon.
It is an amazingly relaxing experience if done the right way. Stress is released and the head and body feels completely different. I am sure there is a name for this but I have no clue.
Some good Indica will do the same.