When I was a little girl, and of course, even now, and I would hear a whisper or even just a pleasant voice, it would send tingles to the back of my head and even down my spine. It would relax me and even make me sleepy. I've experience this sensation for as long as I can remember. I had no idea what the sensation was called or if anyone else experienced it. All I knew was that I loved having someone read to me every night.