25,729 articles
SLC39A8-CDG
SLC39A8-CDG (CDG-IIn, CDG2N, SLC39A8 deficiency) is a rare autosomal recessive congenital disorder of glycosylation caused by ZIP8 manganese-transporter variants, causing manganese depletion, type II transferrin profile, severe neurologic impairment, treatable with manganese and galactose.
Sleep
Sleep is a naturally recurring, reversible state of reduced responsiveness in which the brain cycles through REM and non-REM phases, regulated by circadian rhythms and sleep pressure.
Sleep apnea
Sleep apnea, a disorder of repeated breathing pauses during sleep, has obstructive (OSA) and central types; OSA affects about 15% of men and 5% of women aged 30-70 and is treated first with CPAP.
Sleep apnea testing
Sleep apnea testing is the set of diagnostic procedures, chiefly in-laboratory polysomnography and home sleep apnea testing, used to detect obstructive and central sleep apnea by recording airflow, effort, and oxygen saturation.
Sleep apnea–related hypertension
Sleep apnea–related hypertension is elevated blood pressure driven by obstructive sleep apnea; it is common in resistant hypertension, shows blunted nocturnal dipping, and CPAP lowers blood pressure modestly.
Sleep cycle
Sleep cycle: the repeating NREM (stages 1-3) then REM sequence during sleep, about 80-100 minutes per cycle, four to six per night, deep sleep early and REM later; discovered 1953 by Aserinsky and Kleitman.
Sleep deprivation
Sleep deprivation: getting less sleep than needed (acute total, partial, or chronic restriction). Adults need 7+ hours; impairment rivals alcohol intoxication; linked to cardiometabolic disease and dementia risk.
Sleep diary
A sleep diary is a self-report log of bedtime, awakenings, and rise time kept daily for one to two weeks, the accepted standard for measuring sleep in insomnia care.
Sleep disorder
Sleep disorder: any of more than 100 conditions disturbing normal sleep, including insomnia, sleep apnea, restless legs syndrome, narcolepsy, circadian rhythm disorders, and parasomnias; diagnosed by history and polysomnography, treated with CBT-I, CPAP, or medication.
Sleep Duration
Sleep duration, the total hours of sleep per day (total sleep time), is studied in categories of short, normal, and long sleep against mortality, diabetes, cardiovascular disease, hypertension, stroke, and obesity risk.
Sleep health
Sleep health: a multidimensional positive-health construct of sleep (regularity, satisfaction, alertness, timing, efficiency, duration; RU-SATED), also the National Sleep Foundation's Elsevier journal Sleep Health (2015, ISSN 2352-7218).
Sleep hygiene
Sleep hygiene: behavioral and environmental sleep recommendations (schedule, caffeine timing, dark cool bedroom) first codified by Peter Hauri in 1977; guidelines find it ineffective alone for chronic insomnia versus CBT-I.
Sleep inertia
Sleep inertia: temporary grogginess, disorientation, and impaired performance immediately after waking, lasting 30-60 minutes typically; worst during circadian low and after deep sleep; managed with short naps, caffeine, and light.
Sleep Latency
Sleep latency (sleep-onset latency, SOL) is the time from lights out to the first epoch of any sleep stage. Measured by PSG, actigraphy, diaries, and the MSLT, where mean latency ≤8 minutes supports narcolepsy diagnosis.
Sleep medicine
Sleep medicine is a medical subspecialty concerned with the diagnosis and treatment of sleep and circadian disorders, from insomnia and sleep apnea to narcolepsy and parasomnias.
Sleep paralysis
Sleep paralysis: temporary inability to move or speak while falling asleep or waking, caused by REM atonia persisting into wakefulness; affects about 8% of people, often with intruder or incubus hallucinations, and interpreted culturally as Pandafeche, kanashibari, or jinn attacks.
Sleep restriction
Sleep restriction therapy is a behavioral treatment for chronic insomnia in which time in bed is cut to actual sleep time to consolidate sleep, a core component of CBT-I.
Sleep sex
Sleep sex (sexsomnia) is an NREM parasomnia of involuntary sexual behavior during sleep, arising from N2/N3 with amnesia; triggered by sleep deprivation, alcohol, and sleep apnea; recognized in DSM-5 and ICSD-3-TR.
Sleep Stages
Sleep stages: the AASM's five human sleep states W, N1, N2, N3, and REM (stage R), scored from 30-second polysomnography epochs by EEG, EOG, and EMG patterns; N2 has spindles and K-complexes, N3 delta slow waves, REM atonia.
Sleep study
A sleep study is a diagnostic test recording brain activity, breathing, blood oxygen, and body movement during sleep; attended in-lab polysomnography is the reference standard for diagnosing obstructive sleep apnea.
Sleep-related bruxism
Sleep-related bruxism (sleep bruxism) is rhythmic or non-rhythmic masticatory muscle activity during sleep, now classed as a behavior rather than a disorder; diagnosed by PSG-AV or portable EMG (cut-off 7 events/hour), managed with splints and biofeedback.
Sleep-related eating disorder
Sleep-related eating disorder (SRED), ICD-11 7B00.3, is a parasomnia of involuntary eating during the main sleep period with amnesia, unlike night eating syndrome; linked to sleepwalking, RLS, OSA, and sedative-hypnotics, treated with topiramate or treating the underlying sleep disorder.
Sleep-related hallucinations
Sleep-related hallucinations (ICD-11 7B02.1) are hypnagogic or hypnopompic hallucinations at sleep onset or awakening, an ICSD-3 other-parasomnia category with HHH and CNVH subtypes, prevalence 25-37% and 7-13%.
Sleep-related hypermotor epilepsy
Sleep-related hypermotor epilepsy (SHE), formerly nocturnal frontal lobe epilepsy, is a rare focal epilepsy with brief stereotyped hypermotor seizures from NREM sleep; renamed in 2016, with genetic and extrafrontal forms.
Sleep-related leg cramps
Sleep-related leg cramps, also known as nocturnal leg cramps, are painful involuntary contractions of the calf or foot muscles during sleep, lasting seconds to minutes.
Sleep-related rhythmic movement disorder
Sleep-related rhythmic movement disorder (SRRMD, RMD) is a sleep-related movement disorder with rhythmic large-muscle movements like head banging and body rocking at 0.5-2 Hz, common and benign in infants, a disorder only when sleep, function, or safety is harmed.
Sleeping Beauty transposon system
The Sleeping Beauty transposon system is a non-viral gene delivery method, reconstructed in 1997 from fish transposon sequences, that permanently inserts DNA into a cell's genome.
Sleeptalking
Sleeptalking, or somniloquy (ICD-11 MB60), is the production of unaware speech during sleep, a benign parasomnia with 66% lifetime prevalence, more frequent in NREM sleep, with more correct language in REM.
Sleepwalking
Sleepwalking (somnambulism) is an NREM parasomnia causing walking or complex behaviors during deep N3 sleep, mostly in children, with amnesia afterward; genetic, triggered by sleep deprivation, medications, and sleep apnea.
Sleeve gastrectomy
Sleeve gastrectomy (gastric sleeve, LSG): bariatric operation removing about 80% of the stomach, leaving a banana-shaped tube; the most performed bariatric procedure worldwide, with reflux as its main drawback versus gastric bypass.