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https://eishya-jin.link/2018/04/28/4k-8k%e7%b4%a0%e6%9d%90%e6%98%a0%e5%83%8f%e3%81%af%e7%9d%a1%e7%9c%a0%e5%b0%8e%e5%85%a5%e3%81%ab%e8%89%af%e3%81%84%e3%81%8b%e3%82%82%ef%bc%9f/
4K/8K素材映像は睡眠導入に良いかも?