Journal profile · CLINICAL NEUROLOGY
Somnologie
ISSN 1432-9123 · eISSN 1439-054X · Springer Nature · 4 issues per year
Somnologie: CAS Zone 4 · Medicine (2025 upgraded edition); impact factor 0.8 (journal website); hybrid open access; APC about USD 3,390; median 60 days to acceptance (22 articles, last 24 months); 45 articles in 2025; indexed in ESCI and Scopus.
Scope
Aims, scope and focus
Somnologie is published by Springer Nature 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 48.2% of its articles. (generated from OpenAlex topic counts and CAS ranking data)
Die Zeitschrift Somnologie ist das offizielle Organ der Deutschen Gesellschaft für Schlafforschung und Schlafmedizin (DGSM), der Österreichischen Gesellschaft für Schlafmedizin und Schlafforschung (ÖGSM) und der Schweizerischen Gesellschaft für Schlafforschung, Schlafmedizin und Chronobiologie (SGSSC). Auf der Basis von aktuellen, klinisch relevanten Forschungsergebnissen befasst sich die Somnologie viermal jährlich mit der Ätiologie, Pathophysiologie, Differentialdiagnostik und Therapie der verschiedenen Schlafstörungen. Eine wissenschaftlich hochqualifizierte Analyse der Ätiologie, Pathophysiologie, Epidemiologie, Diagnose und Therapie verschiedener Schlafstörungen erfordert die Kooperation einer Vielzahl von medizinischen Fachdisziplinen. Durch die Zusammenarbeit von Vertretern aus den Bereichen der Epidemiologie, Humangenetik, HNO, Mund-, Kiefer- und Gesichtschirurgie, Innere Medizin, Pneumologie, Kardiologie, Gastroenterologie, Neurologie, Neurophysiologie, Physiologie, Psychologie, Pädiatrie und Pharmakologie erfüllt die Somnologie die multidisziplinären Anforderungen der Schlafforschung und Schlafmedizin. Besonderes Augenmerk liegt hierbei auch auf methodischen Neuerungen der Biomedizinischen Technik. Neben experimentellen oder klinischen Originalarbeiten und Übersichtsarbeiten werden Empfehlungen, Positionspapiere und Leitlinien der DGSM publiziert. Regelmäßig erscheinende Schwerpunktthemen und die Einrichtung einer CME-Rubrik in der Somnologie erfüllen den Aus- und Weiterbildungsanspruch dieser Zeitschrift und der beteiligten Fachgesellschaften. Auf eine ausgewogene Kombination von wissenschaftlichen Inhalten und praxisnahen Inhalten, die der Aus- und Weiterbildung dienen, wird bei der Zusammenstellung der einzelnen Ausgaben Wert gelegt. Based on current, clinically relevant research results, the journal Somnologie focuses on the etiology, pathophysiology, differential diagnostics and treatment of various sleep disorders. A scientific, comprehensive analysis of the various causes of sleep disorders requires the cooperation of several branches of medicine. Through the collaboration of specialists in the areas of epidemiology, human genetics, ENT, OMF, internal medicine, pneumology, cardiology, gastroenterology, neurology, neurophysiology, physiology, psychology, pediatrics, and pharmacology, Somnologie fulfills the multidisciplinary requirements of sleep research and sleep medicine.Special attention is paid to methodological innovations of biomedic
From the journal's Aims & Scope
Research area (LetPub): CLINICAL NEUROLOGY
Editor-in-chief Michael ArztPublisher website
Editorial board by country: none in mainland China; most named Germany 60, Switzerland 7, Austria 4, United States 2, Sweden 2 (76 members with a country) Editorial board ↗Publisher website ·
Main research topics OpenAlex counts of recent articles; shares are approximate
- Sleep and related disordersPsychology17.7%
- Sleep and Wakefulness ResearchNeuroscience16.8%
- Obstructive Sleep Apnea ResearchMedicine13.7%
- Neuroscience of respiration and sleepNeuroscience9.1%
- Circadian rhythm and melatoninNeuroscience5.3%
- Restless Legs Syndrome ResearchMedicine4.7%
- Health and Medical StudiesHealth Professions4.6%
- Sleep and Work-Related FatiguePsychology4.1%
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 |
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 |
Top journal: noReview journal: not marked
CAS Journal Ranking, previous upgraded edition (December 2023)Not covered
Not covered by this edition.
Database indexing
ESCIScopusLetPub
International journal early-warning lists: not listed in any editionLetPub
Indexing the journal's website claims
EmbasePublisher website
Other: Google Scholar, EBSCO, ProQuest, Dimensions, CNKI, Baidu, Naver, OCLC, Portico, CLOCKSS, Semantic Scholar
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 (publisher) 2025
- 0.8Publisher website ·
- 5-year impact factor (publisher) 2025
- 0.7Publisher website ·
- CiteScore 2026-06
- 1.1LetPub ·
- SJR 2026-06
- 0.23LetPub ·
- SNIP 2026-06
- 0.32LetPub ·
- h-index
- 36OpenAlex ·
- i10-index
- 168OpenAlex ·
- 2-year mean citedness
- 0.9OpenAlex ·
- Self-citation rate
- 12.5%LetPub ·
- Share of gold OA articles
- 59.81%LetPub ·
Volume
- Articles per year
- 36LetPub ·
- Downloads per year (publisher) 2025
- 223,800Publisher website ·
Articles by year OpenAlex count · 1,185 in total · the current year is incomplete
| Year | Articles | Open access | Citations |
|---|---|---|---|
| 2026 | 27 | 13 | 1 |
| 2025 | 45 | 23 | 28 |
| 2024 | 51 | 33 | 82 |
| 2023 | 41 | 26 | 59 |
| 2022 | 54 | 35 | 90 |
| 2021 | 41 | 23 | 142 |
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
60 daysMedian, submission to acceptance · P25–P75 50 days – 123 days
- Acceptance to online
- median 32 days (61 articles)
- Submission to online
- median 118 days
- Sample
- 22 articles with submission and acceptance dates (77 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
- Submission to first decision
- 27 daysPublisher website ·
- 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 3,390 / EUR 2,790 / GBP 2,390 | — | — |
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)
Policy excerpts from the journal's websiteData availability, Open access
- Data availability Data availability statements
All original research must include a data availability statement. This statement should explain how to access data supporting the results and analysis in the article, including links/citations to publicly archived datasets analysed or generated during the study. Please see our full policy here. If it is not possible to share research data publicly, for instance when individual privacy could be com…
Source ↗Publisher website ·- Open access Open access publishing
To find out more about publishing your work Open Access in Somnologie, including information on fees, funding and licences, visit our Open access publishing page. Back to top
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 Nature
- Frequency
- 4 issues per year
- ISSN
- 1432-9123
- Electronic ISSN
- 1439-054X
- Latest issue on the website
- Volume 30, Issue 3 (September 2026)
- Official links
- Journal homepage ↗OpenAlex
- Submission system ↗LetPub
- Author guidelines ↗LetPub
FAQ
Frequently asked questions about Somnologie
What CAS zone is Somnologie in?
In the 2025 upgraded edition of the CAS Journal Ranking, Somnologie is in Zone 4 of Medicine, and in Zone 4 of the minor category Clinical Neurology. 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 Somnologie?
The journal's website gives an impact factor of 0.8 (2025); this is the journal's own figure, as LetPub lists none for it; CiteScore 1.1, h-index 36.
How long does peer review take at Somnologie?
Based on the dates recorded on 22 articles published between October 2024 and October 2026 (the last 24 months), the median time from submission to acceptance is 60 days (interquartile range 50–123 days). 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.
Where are the editorial board members of Somnologie based?
Of the 76 board members whose country the journal's board page names, none are in mainland China; the countries named most often are Germany (60), Switzerland (7) and Austria (4). Counted from the institutions listed on the board page; for reference only.
Which databases index Somnologie?
According to LetPub and DOAJ records, Somnologie is indexed in ESCI and Scopus. The journal's website also lists Embase; that list has not been checked against each database.
Is Somnologie open access, and what is the APC?
Somnologie is a hybrid journal. For open-access publication: APC about USD 3,390.
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 2026-08-28). Last updated: .