ASMR stand for Autonomous Sensory Meridian Response and refers to a sensory phenomenon that usually occurs in the scalp, neck, shoulders and even down the spine, triggered usually by a variety of sounds. As of right now, scientific studies are in the early stages, but please understand that this is a real thing. Simply because something has yet to be explained by science, doesn't mean it's not real. Science just has to catch up.

Some scientists have speculated that it could be a form of Synesthesia , which is a neurological phenomenon in which there is an automatic sensory response triggered by another sense (example: people taste or see sounds). It's not yet understood completely, but like ASMR, just a few years ago, it could not be explained by science.