ASMR, or the autonomous sensory meridian response, is a state of deep calm accompanied by a sense of "brain tingles." Not everyone experiences it, but if you do, you know what triggers it: a whisper or other soft sounds, a gentle touch or movement, even watching a Bob Ross video. Physiologist Craig Richard explains the science behind ASMR, and why in some people induces a deeply relaxing response that can resolve insomnia, relaxation, and stress. Plus: Who are the top "artists" of ASMR?

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