生活內底揣趣味(生活中找樂趣) says
9 years ago @Edit 5 years ago
年齡與睡眠時段和睡眠需要量
How Much Sleep Do We Really Need?
via
National Sleep Foundationhttps://imgs.plurk.com/QuY/6Xt/vUYiUtYuYk3QEfIOehc4UVygrj9_mt.png
latest #6
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