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| REM sleep | |
|---|---|
| Name | Rapid eye movement sleep |
| Other names | REM |
| Duration | Variable per sleep cycle |
| Stage number | 5 (convention) |
| First described | 1953 |
| Discovered by | Nathaniel Kleitman; Eugene Aserinsky |
REM sleep REM sleep is a stage of sleep characterized by rapid eye movements, vivid dreaming, and distinctive physiological patterns. It was first described in studies at the University of Chicago and has been central to research in psychology, neuroscience, and medicine. REM is observed across mammalian and avian taxa and is implicated in cognitive, emotional, and homeostatic processes.
REM was revealed in the early 1950s during polysomnographic recordings by researchers at the University of Chicago and subsequently elaborated by scientists at institutions such as the National Institutes of Health and Massachusetts Institute of Technology. Classic field-defining studies were published in journals associated with organizations like the American Psychological Association and Nature Publishing Group. REM typically occurs cyclically across the night, interleaved with non-REM stages described in consensus statements from bodies such as the American Academy of Sleep Medicine and the World Health Organization.
Neurophysiological signatures of REM include desynchronized cortical electroencephalography observed in laboratories at the Max Planck Institute and marked by theta and beta frequencies studied by teams at the Salk Institute and Harvard Medical School. Rapid eye movements stem from pontine structures, notably the locus coeruleus-adjacent pontine tegmentum and the pedunculopontine nucleus, whose activity has been examined in animal models at the Cold Spring Harbor Laboratory and Columbia University. Cholinergic, monoaminergic, and GABAergic systems—investigated by researchers at the Pasteur Institute and Johns Hopkins University—modulate REM onset via circuits involving the thalamus, hypothalamus, and amygdala. REM is associated with muscle atonia produced by descending inhibition from the pontine reticular formation, a phenomenon explored in studies funded by the National Science Foundation and published in outlets linked to the Royal Society.
Prominent theories of REM function were advanced by investigators at institutions like the University of Cambridge and Stanford University. The activation-synthesis hypothesis, originally articulated by researchers with connections to the Harvard University neurobiology community, posits that pontine-generated activity is interpreted by forebrain networks including regions affiliated with the University College London and the University of Oxford. Alternative models emphasize roles in memory consolidation, supported by experimental paradigms from teams at the Massachusetts General Hospital and University of Pennsylvania, implicating hippocampal-cortical dialogue influenced by work from the Max Planck Institute for Human Cognitive and Brain Sciences. Emotional regulation theories draw on clinical research from the Mount Sinai Hospital and McGill University, linking REM modulation to processing in the amygdala, prefrontal cortex, and networks studied by the National Institute of Mental Health.
Developmental trajectories were charted in longitudinal cohorts at the Karolinska Institutet and University of California, Berkeley, showing that REM prevalence is higher in neonates and declines across childhood and adulthood, with alterations in aging populations studied at the Karolinska Hospital and Mayo Clinic. Comparative developmental studies involving species housed at the Smithsonian Institution and Zoological Society of London reveal conserved and divergent REM patterns. Lifespan changes in REM are relevant to neurodevelopmental research programs affiliated with the Children's Hospital of Philadelphia and geriatric studies at the Institute of Aging.
REM-related abnormalities are central to diagnoses published in manuals by the American Psychiatric Association and the World Health Organization. REM sleep behavior disorder has been characterized in clinics such as the Cleveland Clinic and linked to synucleinopathies studied at the University of Helsinki and Karolinska Institute. REM alterations appear in mood disorders researched at the Sackler Institute and in posttraumatic stress disorder cohorts at the Veterans Affairs medical centers. Pharmacological modulation of REM by agents developed by companies collaborating with the Food and Drug Administration affects treatment strategies for depression and narcolepsy described in clinical trials coordinated by the European Medicines Agency.
Electrophysiological measurement of REM employs polysomnography protocols standardized by the American Academy of Sleep Medicine and analytic pipelines developed at centers such as the National Sleep Research Resource and Stanford Center for Sleep Sciences and Medicine. Animal electrophysiology and optogenetics experiments at the Massachusetts Institute of Technology and California Institute of Technology have dissected REM circuitry. Functional imaging studies conducted at the Wellcome Trust Centre for Neuroimaging and Yale University use fMRI and PET tracers validated in collaborations with the National Institutes of Health and imaging consortia including the Human Connectome Project.
Historical accounts trace REM’s discovery to laboratories at the University of Chicago and cultural dissemination through media outlets like the New York Times and documentary work associated with broadcasters such as the BBC. REM and dreaming have influenced arts movements and literature linked to figures connected with the Surrealist movement and writers represented by publishing houses such as Penguin Books and Faber and Faber. Legal and philosophical discussions involving sleep and consciousness have appeared in forums at the Oxford Union and courts in jurisdictions including the United Kingdom and United States Supreme Court.