
It's not a matter of a nice feeling but a medical effect.

Thank you. I didn't know. I think that it's only popular in Japan. It sounds a bit dangerous to me. But I understand the reasoning:
首後ろは大きい血管がいっぱい流れているから良いらしいです。
Some people also recommend to use アイス枕. Here, we only use ice pillows rarely and to relieve neck pain. At least, I've never heard of using them when it's hot.
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This sentence was initially added as a translation of sentence #1687821
added by Scott, July 16, 2012
linked by Scott, July 16, 2012
edited by Scott, July 16, 2012
linked by yippe, January 16, 2017