ASMR, or Autonomous Sensory Meridian Response, is a tingling sensation that typically begins in the scalp and moves down the back of the neck and upper spine. It’s often triggered by specific audio or visual stimuli, such as whispering, tapping, or slow hand movements. ASMR has gained a dedicated online following in recent years, with millions of people tuning in to ASMR videos to help them relax, unwind, and drift off to sleep.