Evidence map›Paper›PMID 27485308›Full record

ArticleNature communications2016

Evidence that birds sleep in mid-flight.

Niels C Rattenborg, Bryson Voirin, Sebastian M Cruz, Ryan Tisdale, Giacomo Dell'Omo, Hans-Peter Lipp, Martin Wikelski, Alexei L Vyssotski

Abstract read
In one paragraph

Article in Nature communications, 2016. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 97 papers.

0numbers the graph read from it
0cells of the map it votes in
97citing papers in PubMed
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

97 citing papers in PubMed.

  1. Article
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  3. Poxvirus Infections in Common Swifts (Veterinary sciences · 2026
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  6. Revitalizing the "biology" in "chronobiology".Npj biological timing and sleep · 2026
    Review
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  12. Article
  13. Article
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  15. Article
  16. Article
  17. Article
  18. An electrophysiological correlate of sleep in a shark.Journal of experimental zoology. Part A, Ecological and integrative physiology · 2024
    Article
  19. Article
  20. Article

37 more citing papers are in PubMed but not listed here.

4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

8 authors.

Niels C RattenborgAvian Sleep Group, Max Planck Institute for Ornithology, Seewiesen 82319, Germany.
Bryson VoirinAvian Sleep Group, Max Planck Institute for Ornithology, Seewiesen 82319, Germany.
Sebastian M CruzDepartment of Migration and Immuno-Ecology, Max Planck Institute for Ornithology, Radolfzell 78315, Germany.
Ryan TisdaleAvian Sleep Group, Max Planck Institute for Ornithology, Seewiesen 82319, Germany.
Giacomo Dell'Omo
Hans-Peter LippInstitute of Anatomy, University of Zurich, Zurich 8057, Switzerland.
Martin WikelskiDepartment of Migration and Immuno-Ecology, Max Planck Institute for Ornithology, Radolfzell 78315, Germany.
Alexei L VyssotskiInstitute of Neuroinformatics, University of Zurich and Swiss Federal Institute of Technology (ETH), Zurich 8057, Switzerland.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Many birds fly non-stop for days or longer, but do they sleep in flight and if so, how? It is commonly assumed that flying birds maintain environmental awareness and aerodynamic control by sleeping with only one eye closed and one cerebral hemisphere at a time. However, sleep has never been demonstrated in flying birds. Here, using electroencephalogram recordings of great frigatebirds (Fregata minor) flying over the ocean for up to 10 days, we show that they can sleep with either one hemisphere at a time or both hemispheres simultaneously. Also unexpectedly, frigatebirds sleep for only 0.69 h d(-1) (7.4% of the time spent sleeping on land), indicating that ecological demands for attention usually exceed the attention afforded by sleeping unihemispherically. In addition to establishing that birds can sleep in flight, our results challenge the view that they sustain prolonged flights by obtaining normal amounts of sleep on the wing.

Indexed as

AnimalsBirdsBrainElectroencephalographyFemaleFlight, AnimalSleep

Identifiers

PMID27485308
PMCPMC4976198

What OpenQuestion holds

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LicenceCC BY
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Registered trials

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.