Value Village ／ Health
This answer is a draft. It stays unpublished until legal review and source verification are complete.
The figure "you should sleep eight hours" has taken on a life of its own around the world. Japan's official guidance does not take that form. The Ministry of Health, Labour and Welfare (MHLW, Japan's health ministry) issued a national sleep guide in 2024, and it is organised quite differently.
In February 2024 the MHLW finalised the "Sleep Guide for Health Promotion 2023" [健康づくりのための睡眠ガイド2023], which groups its recommendations by age: "adults", "children" and "older adults".
The guide is divided by age group. It does not apply a single number to everyone.
For adults, it indicates getting the sleep you need, with 6 hours or more as a guide.
[Verify] This figure is based on information obtained by search. Check it against the original text of the "Sleep Guide for Health Promotion 2023" before publication. We have not been able to confirm the figures for children and older adults, so this article does not cover them. Check the original and add them if needed.
Longer is not automatically better. For older adults, the guide also mentions not spending too long in bed.
[Verify] This point also needs checking against the original text.
One feature of the guide is its emphasis on "sleep restfulness" (睡眠休養感, suimin kyūyō-kan) — the feeling that sleep has actually rested you. Besides the number of hours, whether you feel strong sleepiness during the day is described as a practical clue.
If your wake-up time shifts a lot, your body clock shifts with it. Keeping the gap with weekdays small is easier to manage.
Lying in bed for a long time without sleeping is not recommended. If it continues to the point of affecting your daytime life, see a doctor.
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https://www.mhlw.go.jp/stf/seisakunitsuite/bunya/kenkou_iryou/kenkou/suimin/index.html
https://jssr.jp/files/nexus/20250925-02.pdf
https://www.dietitian.or.jp/trends/2023/342.html
⚠️ Editorial note: the source URLs above were identified by search. Our working environment cannot reach go.jp domains, so the contents have not been checked against the text. Verify every source before publication and record who checked it and when.
What we share here are ideas and everyday practices passed down among people living in Japan, together with general information drawn from public sources. They are not official recommendations, and they are not professional instruction. Practices vary between households and regions.
This is general information. Results vary from person to person and depend on your own conditions and surroundings.
Please decide for yourself, using your own judgement, whether any of this suits your situation. We cannot accept responsibility for any damage, loss or injury arising from following this article.
This article is not meant to diagnose or manage any specific medical condition. If you are worried about your health, see a doctor rather than relying on your own judgement.
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