Journal profile · Clinical Neurology
Sleep and Biological Rhythms
ISSN 1446-9235 · eISSN 1479-8425 · Springer Japan · AUSTRALIA · Quarterly · Founded 2003
Sleep and Biological Rhythms: CAS Zone 4 · Medicine (2025 upgraded edition); impact factor 2.01; hybrid open access; APC about USD 3,990; median 133 days to acceptance (85 articles, last 24 months); community-reported acceptance: easy; 65 articles in 2025; indexed in SCIE and Scopus.
Scope
Aims, scope and focus
Sleep and Biological Rhythms is published by Springer Japan and is in Zone 4 of Medicine in the CAS Journal Ranking (2025 upgraded edition). By OpenAlex counts of its recent articles, its largest topics are Sleep and related disorders, Sleep and Wakefulness Research and Obstructive Sleep Apnea Research, together about 58.1% of its articles. (generated from OpenAlex topic counts and CAS ranking data)
Sleep and Biological Rhythms is the official journal of the Japanese Society of Sleep Research and the Asian Sleep Research Society. Sleep and Biological Rhythms is a quarterly, peer-reviewed scientific and medical journal that publishes original research articles as well as short papers, reviews, case reports and commentaries dealing with sleep and wakefulness, including biological rhythms. Topics onbasic and clinical science, medicine and social science relating to sleep and/or biological rhythms will be considered for publication. By publishing such articles, the Journal aims to promote and extend a healthy and good life for both patients and the general public.
From the journal's Aims & Scope
Research area (LetPub): Clinical Neurology
Editor-in-chief Kazuo ChinPublisher website
Editorial board by country: 1 in mainland China (about 2%); most named Japan 36, United States 9, Switzerland 4, Australia 3, India 2 (64 members with a country) Editorial board ↗Publisher website ·
Main research topics OpenAlex counts of recent articles; shares are approximate
- Sleep and related disordersPsychology26.1%
- Sleep and Wakefulness ResearchNeuroscience23.1%
- Obstructive Sleep Apnea ResearchMedicine8.9%
- Circadian rhythm and melatoninNeuroscience8.6%
- Sleep and Work-Related FatiguePsychology7.4%
- Neuroscience of respiration and sleepNeuroscience6%
- Restless Legs Syndrome ResearchMedicine4.1%
- Parkinson's Disease Mechanisms and TreatmentsMedicine2%
Rankings & indexing
CAS ranking and database indexing
CAS Journal Ranking
CAS Journal Ranking, upgraded edition (March 2025)Medicine Zone 4
| Level | Category | Zone |
|---|---|---|
| Major | Medicine | Zone 4 |
| Minor | Clinical Neurology | Zone 4 |
| Minor | Neurosciences | Zone 4 |
Top journal: noReview journal: no
CAS Xinrui Journal Ranking (March 2026)Medicine Zone 4
| Level | Category | Zone |
|---|---|---|
| Major | Medicine | Zone 4 |
| Minor | Clinical Neurology | Zone 4 |
| Minor | Neurosciences | Zone 4 |
Top journal: noReview journal: not marked
CAS Journal Ranking, previous upgraded edition (December 2023)Medicine Zone 4
| Level | Category | Zone |
|---|---|---|
| Major | Medicine | Zone 4 |
| Minor | Clinical Neurology | Zone 4 |
| Minor | Neurosciences | Zone 4 |
Top journal: noReview journal: no
Database indexing
SCIEScopusLetPub
International journal early-warning lists: not listed in any editionLetPub
Indexing the journal's website claims
EmbasePsycINFOPublisher website
Other: Google Scholar, EBSCO, ProQuest, Dimensions, CNKI, Baidu, Naver, OCLC, Portico, CLOCKSS
As the journal's website lists them, not checked against each database; for Web of Science editions the records above apply.
Editions, and major and minor categories, are shown separately and never merged into one zone; check which edition your institution uses before you submit or report.
Metrics
Impact metrics and publication volume
Impact
- Impact factor
- 2.01LetPub ·
- Impact factor (publisher) 2025
- 2Publisher website ·
- 5-year impact factor (publisher) 2025
- 2Publisher website ·
- CiteScore 2026-06
- 3.4LetPub ·
- SJR 2026-06
- 0.59LetPub ·
- SNIP 2026-06
- 0.75LetPub ·
- h-index
- 25LetPub ·
- h-index
- 51OpenAlex ·
- i10-index
- 384OpenAlex ·
- 2-year mean citedness
- 1.24OpenAlex ·
- Self-citation rate
- 0%LetPub ·
- Share of gold OA articles
- 17.48%LetPub ·
Volume
- Articles per year
- 49LetPub ·
- Downloads per year (publisher) 2025
- 239,300Publisher website ·
Articles by year OpenAlex count · 1,502 in total · the current year is incomplete
| Year | Articles | Open access | Citations |
|---|---|---|---|
| 2026 | 60 | 35 | 10 |
| 2025 | 65 | 65 | 69 |
| 2024 | 56 | 55 | 145 |
| 2023 | 67 | 67 | 364 |
| 2022 | 82 | 82 | 540 |
| 2021 | 61 | 35 | 422 |
Sources count differently and were observed at different times, so each source's own value is kept; "publisher" marks figures from the journal's website.
Review & acceptance
Review time and acceptance
Review time from article dates manuscript dates registered with Crossref · to
133 daysMedian, submission to acceptance · P25–P75 98 days – 183 days
- Acceptance to online
- median 19 days (85 articles)
- Submission to online
- median 154 days
- Sample
- 85 articles with submission and acceptance dates (134 in the window); the latest was accepted on
Only articles that were accepted and published are counted, not the time spent on rejected manuscripts, so this usually runs longer than a publisher's "time to first decision".
Other sources
- Average review time (community reports)
- over 12 weeksLetPub ·
- Average acceptance (community reports)
- EasyLetPub ·
- Submission to first decision
- 27 daysPublisher website ·
- Peer review
- Single anonymous peer review, Double anonymous peer reviewPublisher website
Community reports come from authors' own submissions (confidence 0.5) and are not a promise from the journal; for publisher figures, the journal's own definitions apply.
Fees & open access
APC and open-access policy
Hybrid open accessLetPub
A subscription journal in which authors can pay to publish their article open access.
| Source | APC | Fee waiver | License | Observed |
|---|---|---|---|---|
| OpenAlex | USD 3,990 / EUR 2,990 / GBP 2,590 | — | — |
A hybrid journal charges the APC only when the author chooses open access; publishing under the subscription model is usually free.
The journal's website is authoritative for fees; sources were observed at different times and each keeps its own value, without averaging.
Submission
Article types and submission policies (journal website)
What to prepare6 items from the author guidelines
- Abstract
- ≤ 250 words
- Keywords
- ≥ 4
- Manuscript length
- ≤ 3,000 words
- Reference style
- Numbered, in order of citation
- Suggested reviewers
- Optional
- Cover letter
- Required
Article types accepted11
- case report(1) Original Articles Full-length reports of current research in either basic or clinical research. Word limit: 3,000 words excluding the abstract, references, …Length not stated
- case reports(3) Case Reports Clinical cases of exceptional interest and novelty are considered for publication.Length not stated
- letter(1) Original Articles Full-length reports of current research in either basic or clinical research. Word limit: 3,000 words excluding the abstract, references, …Length not stated
- letters to the editor(1) Original Articles Full-length reports of current research in either basic or clinical research. Word limit: 3,000 words excluding the abstract, references, …Length not stated
- original article(1) Original Articles Full-length reports of current research in either basic or clinical research. Word limit: 3,000 words excluding the abstract, references, …Length not stated
- original articles(1) Original Articles Full-length reports of current research in either basic or clinical research.Length not stated
- review(1) Original Articles Full-length reports of current research in either basic or clinical research. Word limit: 3,000 words excluding the abstract, references, …Length not stated
- review article(1) Original Articles Full-length reports of current research in either basic or clinical research. Word limit: 3,000 words excluding the abstract, references, …Length not stated
- review articles(5) Review Articles Survey, evaluation, and critical interpretation of recent research, data, and concepts in the fields covered by the journal.Length not stated
- short papers(2) Short Papers Short papers cover new findings that substantially and immediately affect research or clinical practice.Length not stated
- survey(1) Original Articles Full-length reports of current research in either basic or clinical research. Word limit: 3,000 words excluding the abstract, references, …Length not stated
Policy excerpts from the journal's websiteAI use, Authorship, Conflicts of interest, Publication ethics, License & copyright, Open access, Peer review
- AI use Generative AI Images
Please check Springer’s policy on generative AI images and make sure your work adheres to the principles described therein. Back to top
Source ↗Publisher website ·- Authorship Authorship principles
These guidelines describe authorship principles and good authorship practices to which prospective authors should adhere to. Authorship clarified The Journal and Publisher assume all authors agreed with the content and that all gave explicit consent to submit and that they obtained consent from the responsible authorities at the institute/organization where the work has been carried out, before th…
Source ↗Publisher website ·- Conflicts of interest Disclosures and declarations
All authors are requested to include information regarding sources of funding, financial or non-financial interests, study-specific approval by the appropriate ethics committee for research involving humans and/or animals, informed consent if the research involved human participants, and a statement on welfare of animals if the research involved animals (as appropriate). The decision whether such …
Source ↗Publisher website ·- Publication ethics Compliance with Ethical Standards
Plagiarism screening software may be used Model summary
To ensure objectivity and transparency in research and to ensure that accepted principles of ethical and professional conduct have been followed, authors should include information regarding sources of funding, potential conflicts of interest (financial or non-financial), informed consent if the research involved human participants, and a statement on welfare of animals if the research involved an…
Source ↗Publisher website ·- License & copyright Copyright
Open Choice articles do not require transfer of copyright as the copyright remains with the author. In opting for open access, the author(s) agree to publish the article under a Creative Commons license. Details of the OA licences offered to authors can be found on the individual journal website, in the journal's How to publish with us guide. Back to top
Source ↗Publisher website ·- Open access Open access publishing
Open Choice copyright remains with author under Creative Commons license Model summary
To find out more about publishing your work Open Access in Sleep and Biological Rhythms, including information on fees, funding and licences, visit our Open access publishing page. Back to top
Source ↗Publisher website ·- Peer review Review Process
Single-blind peer review Model summary
Manuscripts are reviewed with due respect for the author's confidentiality. At the same time, reviewers also have rights to confidentiality, which are respected by the editors. Sleep and Biological Rhythms uses a single-blind peer-review system, where the reviewers are aware of the names and affiliations of the authors, but the reviewer reports provided to authors are anonymous. Single-blind peer …
Source ↗Publisher website ·
Excerpts are quoted from the journal's website; "model summary" lines are written by Workers AI and checked against the text. The journal's website is authoritative.
Profile
Publication details and official links
- Publisher
- Springer Japan
- Country or region
- AUSTRALIA
- Language
- English
- Frequency
- Quarterly
- Founded
- 2003
- ISSN
- 1446-9235
- Electronic ISSN
- 1479-8425
- Latest issue on the website
- Volume 24, Issue 3 (July 2026)
- Official links
- Journal homepage ↗OpenAlex
- Submission system ↗LetPub
- Author guidelines ↗LetPub
FAQ
Frequently asked questions about Sleep and Biological Rhythms
What CAS zone is Sleep and Biological Rhythms in?
In the 2025 upgraded edition of the CAS Journal Ranking, Sleep and Biological Rhythms is in Zone 4 of Medicine, and in Zone 4 of the minor category Clinical Neurology / Neurosciences. In the 2026 Xinrui edition it is in Zone 4 of Medicine. Zones from different editions, and from major and minor categories, are not interchangeable.
What is the impact factor of Sleep and Biological Rhythms?
The latest impact factor listed by LetPub is 2.01; CiteScore 3.4, h-index 51.
How long does peer review take at Sleep and Biological Rhythms?
Based on the dates recorded on 85 articles published between October 2024 and October 2026 (the last 24 months), the median time from submission to acceptance is 133 days (interquartile range 98–183 days); authors report an average review time of over 12 weeks; the community-reported acceptance is “Easy”. Article statistics cover accepted papers only, publisher figures follow the journal's own definitions, and community reports come from authors' own submissions; none is a promise from the journal.
What are the manuscript requirements of Sleep and Biological Rhythms?
According to the journal's author guidelines: Abstract: ≤ 250 words; Keywords: ≥ 4; Manuscript length: ≤ 3,000 words; Reference style: Numbered, in order of citation; Suggested reviewers: Optional; Cover letter: Required. A model extracted these from the author guidelines and each was checked against the text; check the latest version on the journal's website before submitting.
Where are the editorial board members of Sleep and Biological Rhythms based?
Of the 64 board members whose country the journal's board page names, 1 (about 2%) are in mainland China; the countries named most often are Japan (36), United States (9) and Switzerland (4). Counted from the institutions listed on the board page; for reference only.
Which databases index Sleep and Biological Rhythms?
According to LetPub and DOAJ records, Sleep and Biological Rhythms is indexed in SCIE and Scopus. The journal's website also lists Embase and PsycINFO; that list has not been checked against each database.
Is Sleep and Biological Rhythms open access, and what is the APC?
Sleep and Biological Rhythms is a hybrid journal. For open-access publication: APC about USD 3,990.
Sources and updates
The facts on this page come from LetPub, OpenAlex, Publisher website; every figure is tagged with its source and the date it was observed, and conflicting values are kept per source. LetPub source page: view ↗ (archived 2026-08-25). Last updated: .