Whisper it... ASMR videos are the quiet revolution going global

Viewing sensory films of people tapping, crinkling paper and scratching beards can trigger brain tingles that are relaxing - and advertisers hope will entice you to buy

It all started when people discovered that softly-spoken instructional videos on YouTube - often including tapping, brushing and stroking sounds - gave them a curious head-tingling sensation and an almost euphoric feeling of calm.

This autonomous sensory meridian response (ASMR) has since become a global phenomenon and a new self-help book, Brain Tingles, is hoping to encourage more of us to experience it in our everyday lives.