ASMR , otherwise known as "the head orgasm".
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ASMR (Autonomous Sensory Meridian Response), also known as AIHO (Attention induced head orgasm), is a physical sensation characterized by a pleasurable tingling that typically begins in the head and scalp, and often moves down the spine and through the limbs.
Some triggers of ASMR include:
•Slow speech patterns, accents, soft-speaking voices and whispers.
•Lip sounds/smacking/eating
•Clicking sounds, brushing sounds, white noise, etc.
•Painting/drawing
•Instructional videos
•Watching other people performing simple tasks
•Getting close, personal attention from someone (eye-exam, make-over, etc.)
•Haircuts, people playing with your hair
As someone who experiences ASMR, i'm not really sure how to explain it to people who don't feel the "head tingles".
There is a community on YouTube dedicated to making soft spoken ASMR videos, and I watch these every night to help me sleep, as well as just for relaxation purposes.
Here are a couple videos I really like, let me know if you feel anything watching them. Does your head tingle? Do you feel relaxed? Anything? Headphones highly recommended.
Relaxing Guide To Sleep (Soft Spoken) - YouTube
*_* Oh such a good 3D-sound ASMR video *_* - YouTube
Cranial Nerve Exam Role Play (ASMR) - YouTube
ASMR Role Play: Supportive Friend - YouTube