https://classifieds.co.jp/cant-sleep-how-to-improve-the-quality-of-sleep-global-experts-go-to-bed-30-minutes-early-the-most-important-thing-is-the-amount-of-sleep-tokyo-shimbun-tokyo-web/
Can’t sleep… How to improve the quality of sleep? Global experts “Go to bed 30 minutes early” “The most important thing is the amount of sleep”: Tokyo Shimbun TOKYO Web