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Topic · Experimental and Cognitive Psychology

Sleep and related disorders

Sleep and related disorders is a research topic within Experimental and Cognitive Psychology. Science Explorer counts 47k research works in it since 1950. 9.9% of them reached the world's top 10% most cited for their field and year.

This cluster of papers encompasses a wide range of research on sleep and insomnia, including topics such as the epidemiology of insomnia, the effects of sleep duration on health, cognitive behavioral therapy for insomnia, and the psychometric evaluation of sleep measures. It also covers the impact of sleep on various health outcomes, including cardiovascular disease, diabetes, obesity, and mental health. Additionally, the cluster includes studies on the role of circadian rhythms and sleep quality in overall well-being.

  • Insomnia
  • Sleep Duration
  • Cognitive Behavioral Therapy
  • Sleep Quality
  • Meta-Analysis
  • Epidemiology
  • Chronic Insomnia
  • Psychometric Evaluation
  • Health Consequences
  • Circadian Rhythms
Research works
47k
fractional, since 1950
In the world top 10%
4.7k
per year above
Top-10% rate
9.9%
share of its works in the world top 10%
Growth, 2018-21 → 2022-25
+39%
the tick is no change
Largest producer
United States
40% of the 10 largest, 2022-now
Sleep and related disorders

Which countries lead Sleep and related disorders research?

By volume, the United States and China publish the most (4.6k and 2.6k works in 2022-now).

By volume, 2022-now

  1. 1 United States 4.6k works
  2. 2 China 2.6k works
  3. 3 United Kingdom 661 works
  4. 4 Australia 634 works
  5. 5 India 606 works
  6. 6 Japan 574 works
  7. 7 Canada 507 works
  8. 8 Brazil 460 works
  9. 9 Germany 458 works
  10. 10 France 453 works

How concentrated that is

The same countries as shares of everything the list above accounts for. A node where two countries do two thirds of the work and one spread evenly across twelve read alike as a ranking and not at all alike here.

United States: 39.7%China: 22.4%United Kingdom: 5.8%Australia: 5.5%6 others listed: 26.7%40%largest
United States4,552 · 39.7%China2,567 · 22.4%United Kingdom661 · 5.8%Australia634 · 5.5%6 others listed3,058 · 26.7%

Shares of the rows listed above, not of the whole node.

Which institutions lead Sleep and related disorders research?

By volume in 2022-now, Harvard University publishes the most Sleep and related disorders research, followed by Stanford University and United States Department of Veterans Affairs.

By volume, 2022-now

  1. 1 Harvard UniversityUnited States 235 works
  2. 2 Stanford UniversityUnited States 93 works
  3. 3 United States Department of Veterans AffairsUnited States 91 works
  4. 4 University of PittsburghUnited States 85 works
  5. 5 InsermFrance 84 works
  6. 6 Johns Hopkins UniversityUnited States 77 works
  7. 7 Pennsylvania State UniversityUnited States 75 works
  8. 8 Shanghai Jiao Tong UniversityChina 69 works
  9. 9 University of PennsylvaniaUnited States 69 works
  10. 10 Peking UniversityChina 67 works

Who are the leading researchers in Sleep and related disorders?

The most-cited researchers publishing on Sleep and related disorders include Rob Knight, George Davey Smith and Walter Churchill Willett.

  1. 1 Rob Knight United States 468k citations
  2. 2 George Davey Smith United Kingdom 435k citations
  3. 3 Walter Churchill Willett United States 411k citations
  4. 4 Mark J. Daly United States 403k citations
  5. 5 Ronald C. Kessler United States 360k citations
  6. 6 Hermann Brenner Germany 343k citations
  7. 7 Cyrus Cooper United Kingdom 342k citations
  8. 8 Emelia J. Benjamin United States 341k citations
  9. 9 Valery L. Feigin New Zealand 341k citations
  10. 10 Jun Wang China 340k citations

Ranked by citations received across their whole record, among researchers with at least three works on this topic.

What are the most cited papers in Sleep and related disorders?

The most cited paper in Sleep and related disorders is "The Pittsburgh sleep quality index: A new instrument for psychiatric practice and research" (Daniel J. Buysse, Charles F. Reynolds, T. H. Monk et al., 1989), with 35,692 citations. Next come "A New Method for Measuring Daytime Sleepiness: The Epworth Sleepiness Scale" (17,509) and "The Occurrence of Sleep-Disordered Breathing among Middle-Aged Adults" (10,268).

Most cited papers
#PaperReleasedCitations
1 The Pittsburgh sleep quality index: A new instrument for psychiatric practice and research Daniel J. Buysse, Charles F. Reynolds, T. H. Monk et al. · Psychiatry Research May 1989 35,692
2 A New Method for Measuring Daytime Sleepiness: The Epworth Sleepiness Scale Murray W. Johns · SLEEP Nov 1991 17,509
3 The Occurrence of Sleep-Disordered Breathing among Middle-Aged Adults Terry B Young, Mari Palta, Jerome A. Dempsey et al. · New England Journal of Medicine Open access 29 Apr 1993 10,268
4 Validation of the Insomnia Severity Index as an outcome measure for insomnia research Célyne Bastien · Sleep Medicine Jul 2001 8,166
5 Sleep Drives Metabolite Clearance from the Adult Brain Lulu Xie, Hongyi Kang, Qiwu Xu et al. · Science Open access 17 Oct 2013 5,527
All 100 most cited papers, with filters and sorting

Where is Sleep and related disorders research done?

The largest centres of Sleep and related disorders research in 2022-now are Beijing (China), Seoul (South Korea), Shanghai (China) and Tokyo (Japan). Among places with at least 20 works in it, it is an unusually large share of all research in Rockhampton.

Largest cities, 2022-now

  1. 1 BeijingChina 335 works
  2. 2 SeoulSouth Korea 238 works
  3. 3 ShanghaiChina 203 works
  4. 4 TokyoJapan 193 works
  5. 5 LondonUnited Kingdom 190 works
  6. 6 BostonUnited States 188 works
  7. 7 ParisFrance 187 works
  8. 8 GuangzhouChina 176 works
  9. 9 New YorkUnited States 164 works
  10. 10 MelbourneAustralia 151 works

Where it is the local speciality

  1. RockhamptonAU · 30.6 works19×
← less than its size predicts1×more →

Location quotient: how much more of its research is in Sleep and related disorders than the world average.

See Sleep and related disorders on the map

Where is the best place to study Sleep and related disorders?

Among universities, judged by research, Harvard University, National University of Singapore and Shanghai University of Sport score highest, combining excellence, specialisation, size, growth and international reach. Research strength is one signal when choosing where to study; it does not measure teaching.

0%20%40%mean 15.87%fractional works in this field (log) →share of work in the world top 10% →Shanghai University …Peking UniversityNational University …Harvard University
above the meannear itbelow it

One dot per university in the first ten of the table below, at the default weights. The upper left is the interesting corner: small places doing unusually strong work.

Excellenceshare of its work in the world top 10%, 2022-now and all time averaged
40%
Specialisationhow much of its work is in this field, counted up to 10× the world share
10%
Sizeits output in this field, on a log scale
30%
Growthoutput growth, counted from -20% to +20%
10%
Internationalshare of its work with a co-author abroad
10%
Each slider sets a weight; the share it gets of the score is beside it.
#UniversityScoreTop 10%SpecialisationWorksGrowth
1Harvard UniversityUnited States 71.214.9%5.2×235 +9.9%
2National University of SingaporeSingapore 60.916.2%3.1×53 +62.8%
3Shanghai University of SportChina 59.730.5%12.4×10 -
4Peking UniversityChina 57.517.5%2.3×67 +113.8%
5Flinders UniversityAustralia 57.511.8%11.6×44 +40.7%
6Stanford UniversityUnited States 57.19.1%4.5×94 +25.9%
7Monash UniversityAustralia 57.011.9%4.4×60 +20.0%
8The University of SydneyAustralia 55.814.6%3.2×56 +18.9%
9Pennsylvania State UniversityUnited States 55.110.4%4.8×75 +20.2%
10University of FreiburgGermany 54.621.8%4.0×26 +24.4%

Universities only. The score blends excellence (40%), size (30%), specialisation (10%), growth (10%), international reach (10%), 2022-now; growth compares 2018-21 with 2022-25 and counts up to +20%, since a jump from a small base is mostly noise.

Every institution in Sleep and related disorders, country by country

Is Sleep and related disorders research growing?

Output in 2022-2025 was 39% higher than in 2018-2021, peaking in 2025. The fastest-growing topics are Sleep and related disorders.

still counting19801990200020102020
grewheldshrank

The same series as a ribbon: one cell per year, darker for more. The line above answers how much; this answers when.

Its share of all research

Growing output can still be a shrinking share: all of science grows. This is Sleep and related disorders as a percentage of every work published that year, 0.064% in 2024.

still counting0.025%0.050%0.075%Sleep and related disorders0.075% in 202519801990200020102020

Fractional works of Sleep and related disorders over all fractional works that year. How the balance of science has shifted.

How much of it reaches the world top 10%

Year by year.

still counting5%10%15%Sleep and related disorders9.8% in 2025200020102020

Of each year's works in it, the share that reached the world's 10% most cited for their field and year. A field is the world for its own topics, so there is no other line to hold it against.

Which topics inside it are moving

Growth and decline on one axis around a shared zero. Two lists side by side hide the thing that matters: whether the growth dwarfs the decline, or the other way round.

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