Sleep is a fundamental aspect of excellent health, however the terminology roughly sleep have the right to make it hard to understand also exactly how sleep functions and also just how to sleep better.

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As with many scientific and also clinical areas, sleep science uses numerous technical terms. In some cases, they are strictly characterized to standardize terminology used by researchers and also wellness professionals. In other instances, terms are provided colloquially and also, therefore, they are more loosely defined. In addition, many kind of sleep terms in this dictionary are offered differently by sleep professionals and also the general public.

This sleep dictionary reviews vital terminology, defines the relevant meanings, and offers conmessage about how they may be offered. Our goal is to make certain that you gain the many out of our evidence-based resources by better knowledge crucial concerns that influence your sleep.

Because of their complexity, sleep disorders are not spanned in this sleep dictionary. Readers in search of information about sleep disorders are encouraged to visit our landing page for sleep disorders. Tright here you have the right to discover a general oversee as well as links to detailed resources about particular conditions.

Actigraphy: Tracking the body’s motion over time. Actigraphy, such as via wearable gadgets, can be used to meacertain the amount of time that a person spends doing various forms of activities, consisting of sleep.Acute: Short-term, sudden, or severe. When provided to define sleeping problems or disorders, acute is frequently provided to distinguish from chronic problems.Artificial light: Light that originates from a source various other than the sunlight.Aromatherapy: The usage of particular smells to impact elements of physical or mental health. In the context of sleep, aromatherapy frequently entails disseminating fragrances supposed to induce relaxation at night or alertness during the day.
Atonia: Temporary paralysis of a lot of muscles of the body. Atonia occurs during rapid eye movement (REM) sleep, protecting against muscle task other than for the muscles that regulate breapoint, pulse, and eye activity.Awakenings: The act of waking up from any type of stage of sleep. In a sleep research, awakenings may be detected by alters in activity levels of the heart, lungs, brain, and also muscles.Bad dream: A dream duration that requires negative or bothersome content but does not cause a perchild to wake up from the dream.Bilevel positive airway press (BPAP) device: A machine that uses pressurized air pumped via the mouth or nose to store the airmethod open up and proccasion lapses in breathing. It is often provided to treat obstructive sleep apnea. In a BPAP machine, the level of air pressure is different for inhalation and also exhalation.Biphasic sleep: A sleep pattern in which a person’s complete everyday sleep is broken into 2 segments. The many prevalent biphasic sleep pattern entails one sleep duration at night and also one nap throughout the day.Blue light: A kind of light via a particular wavelength that is component of the visible light spectrum. Blue light is regularly emitted by many type of LEDs and also electronic gadgets and also may have actually a greater effect on circadian rhythm than various other wavelengths of light.Chronic: Long-lasting or recurring. When used to explain resting difficulties or disorders, the term chronic is often offered to distinguish from acute problems.Circadian alerting system: A procedure of signals sent out from the brain that promote wakefulness and also alertness, helping to manage sleep-wake fads.Circadian pacemaker: A component of the brain known as the suprachiasmatic nucleus (SCN) that controls circadian rhythm, sfinishing signals to control the feature of various bodily units. Light expocertain is a central element that influences the feature of the circadian pacemaker.Circadian rhythm: The body’s about 24-hour interior clock that helps coordinate the timing of a broad range of physical and also mental features, including sleep.Chronobiology: The study of natural rhythms that influence living organisms. In sleep science, chronobiology greatly concentrates on circadian rhythm.Chronotype: A pattern of everyday sleep-wake activity that reflects a person’s circadian rhythm. Examples of chronoforms include “night owls” and also “larks.”Cognitive-behavioral therapy for insomnia (CBT-I): A kind of counseling that aims to readjust negative thinking around sleep while encouraging healthier sleep behavior. It is a specific form of cognitive-behavioral treatment (CBT) adjusted to resolve insomnia.Cognitive impairment: Difficulty pertained to mental features such as reasoning, attention, reactivity time, memory, discovering, and judgment.Continuous positive airway press (CPAP) device: A machine that delivers a steady stream of pressurized air through the mouth or nose to store the airway open and minimize disordered breapoint. It is a widespread therapy for obstructive sleep apnea. With a CPAP machine, the level of press continues to be the same throughout inhalation and exhalation.Daytime impairment: Negative effects of resting difficulties that occur in the time of waking hours. Daytime impairments have the right to incorporate cognitive deficits, physical difficulties, and also emotional or mood disturbances.Deep sleep: The last phase of non-rapid eye activity (NREM) sleep. During this stage, breapoint and heart price drop to their lowest levels, and brain activity slows but has bursts of specific types of brain waves recognized as delta waves. Deep sleep is likewise well-known as stage 3, N3, delta sleep, or slow-wave sleep.Delta sleep: The sleep phase noted by high amplitude brain waves recognized as delta waves. Delta sleep is the last phase of NREM sleep, likewise known as stage 3, N3, deep sleep, or slow-wave sleep.Diurnal: Activity throughout the daytime.Dream: Thoughts or imeras that occur while sleeping. Dreams have the right to take place throughout any kind of phase of sleep but are the majority of prevalent and vivid in REM sleep. Dream content can be positive, negative, or confutilizing. It is believed that we do not remember the majority of desires.Dream recall: The capacity to remember dream content after waking up.Electroencephalograph (EEG): A test that provides sensors on the scalp to meacertain brain activity. Patterns of brain waves on an EEG assist determine stages of the sleep cycle. An EEG is a normal part of a polysomnogram, a type of specialized sleep examine.Entrainment: In the context of sleep, the synchronization of a person’s circadian rhythm with the day-to-day cycle of light and dark. The circadian pacemaker’s response to light is a core component of this procedure of entrainment.Excessive daytime sleepiness (EDS): Drowsiness or difficulty remaining alert or awake throughout the day.Fatigue: A feeling of a lack of mental or physical energy. Fatigue frequently overlaps via excessive daytime sleepiness, cognitive disability, and various other symptoms of sleep problems.Homeostatic sleep drive: The body’s self-regulating device for sleepiness. Sleep drive, or the have to sleep, is at a low suggest soon after waking up and grows the longer a perboy goes without sleep.Hormones: Chemical messengers that take a trip via blood vessels and also regulate a substantial array of bodily functions. The system of hormone manufacturing and regulation is well-known as the endocrine system.Hyperarousal: A state of heightened stress, tension, or feeling “on alert.” Hyperarousal is connected through insomnia and also the inability to loss asleep or stay asleep.Hypersomnolence: Excessive sleepiness in the time of times when a perboy expects to be awake. Often referred to as too much daytime sleepiness or hypersomnia.Hypersomnia: A sleep disorder marked by excessive sleepiness when a perchild must feel awake. Hypersomnia is defined by — and may be described as — hypersomnolence or extreme daytime sleepiness.Hypnagogic: Taking place in the time period appropriate around falling asleep.Hypnogram: A graph that visually records the development of sleep throughout one sleep duration. Typically developed during a sleep study (polysomnogram), a hypnogram mirrors the amount of time invested in each sleep stage and also the number of awakenings.Hypnopompic: Taking location in the duration appropriate approximately waking up from sleep.Hypnotic: A form of medication that induces sleepiness.Hypopnea: Extremely slow-moving or shpermit breathing.Hypoxia: A state of diminished oxygen level. Hypoxia in particular tworries deserve to be a repercussion of sleep-disordered breapoint.Insomnia: A sleep disorder in which a perkid cannot loss asleep or sleep as lengthy as they desire to, even though they have actually the chance to sleep. Insomnia can result in daytime handicap, and is commonly categorized as acute or chronic. Insomnia has actually a strict clinical meaning, however the term is frequently employed colloquially to describe resting problems mostly.Inadequate sleep: A problem in which the mind or body execute not function properly bereason of brief sleep duration or extreme sleep fragmentation.Jet lag: A problem in which circadian rhythm is desynchronized from the light-dark cycle bereason of quick travel across multiple time areas.Light sleep: A widespread term for phase 1 or N1 sleep when a perkid is most quickly awoken. Light sleep may at times describe both phase 1 and phase 2 NREM sleep.Light therapy: A therapy for some sleep troubles that employs brief durations of exposure to an extremely bideal light to change a person’s circadian timing.Long sleep: A sleep period that lasts for even more hrs than is recommended based upon a person’s age and health.Lucid dream: A dream in which the perkid is actively conscious of the fact that they are dreaming.Melatonin: A hormone developed by the body that helps to manage circadian rhythm and sleep. Melatonin is commonly developed in response to darkness. Melatonin is also discovered in some foods items. A prescription sleep assist ca rise melatonin levels, and also synthetically developed melatonin is offered as a dietary supplement sleep assist.Metabolism: A basic term that includes a variety of bodily processes to create and also use energy.Microsleep: A exceptionally short lapse into sleep. Microsleeps commonly last for simply a few seconds and also are linked through extreme daytime sleepiness.Monophasic sleep: A sleep pattern in which a person’s complete everyday sleep occurs in the time of only one sleep period.N1 sleep: N1 describes the initially stage of NREM sleep and also is also recognized as phase 1.N2 sleep: N2 is the second phase of NREM sleep, additionally recognized as phase 2.N3 sleep: N3 is the third and final stage of NREM sleep and also is also well-known as stage 3, deep sleep, delta sleep, or slow-wave sleep.Nap: A short sleep duration, usually taken throughout the day, apart from a person’s major sleep duration. A nap might also be described as a siesta, its name in Spanish.Natural light: Light that is produced by the sunlight.Neurotransmitter: A kind of chemical that facilitates communication among brain cells. Changes in neurotransmitter task levels influence most forms of physical and psychological functions, consisting of sleep and also wakefulness.Nightmare: A dream via negative content that reasons a person to wake up from sleep. Immediately after waking up, a perboy typically remembers the content of the nightmare.Nocturia: Frequent uricountry at night. Most technical definitions think about nocturia to be awakening one or more times to urinate, however some studies focus on the effects of multiple bathroom trips.Nocturnal: Taking area during the night.Non-quick eye motion sleep (NREM): One of 2 types of sleep, NREM consists of the initially three sleep stages (N1, N2, and also N3). Throughout NREM sleep, the brain and also body’s activity levels drop noticeably compared to wakefulness. The propercent of time invested during NREM sleep is commonly highest throughout the initially half of a sleep period.Partial sleep deprivation: Sleep duration that is better than zero however much less than the recommfinished amount. The amount of sleep permitted in study about partial sleep deprivation can differ by research. Partial sleep deprivation is unique from full sleep deprivation, which involves not sleeping at all.Pharmacotherapy: The usage of medications such as prescription drugs.Polysomnography: Use of a committed sleep examine, recognized as a polysomnogram, that tracks multiple aspects including brain waves, muscle task, and also eye activity. Polysomnography is generally percreated in a sleep clinic and also may be provided to diagnose numerous forms of sleep disorders.

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Confident airway push (PAP) device: A machine that pumps pressurized air via the nose or mouth to help store the airmeans at the back of the throat open throughout sleep. PAP gadgets are provided primarily to treat obstructive sleep apnea. Instances encompass consistent (CPAP) and also bilevel (BPAP) devices.