Glossary of Terms Used in Sleep Disorders
Acute Insomnia
The inability to sleep well for a period of three weeks to 6 months. After this time the person stops experiencing insomnia and therefore has not progressed into the more severe form of chronic insomnia.Actigraph
An actigraph is an instrument that is used to measure body movement.Advanced Sleep Phase Syndrome
The individuals sleeping and waking cycle is advanced well ahead of a conventional bedtime. Consequently they want to fall asleep or wake up too early. It is a circadian rhythm disorder (see definition below).Antidepressant
Antidepressants are a category of prescribed medications that are commonly used for the treatment of depression. They are sometimes used as a treatment option for certain sleep disorders such as cataplexy and sleep paralysis. There is some evidence that they may reduce REM sleep in some individuals.Apnea
The cessation of airflow at the mouth and nostrils for a minimum of 10 seconds.Apnea Index
This measures how severe the sleep apnea is and is a measure of the number of apnea events per hour.Arousal
Arousal is the change from being asleep to waking up. The term can also be used when an individual moves from stage 3 or 4 sleep (deep sleep) to a lighter sleep stage (stage 1, 2 or REM).Arousal Disorder
Arousal disorder is a parasomnia disorder (see definition below) that is related to certain unusual or abnormal arousal activities. Somnumbalism ( sleepwalking ) and night terrors are some examples.Arousal Threshold
The arousal threshold is defined as how easy it is to wake a sleeping individual at a particular time.Bruxism
The grinding of ones teeth during sleep.Cataplexy
This is a medical condition that most often affects people who have narcolepsy. Cataplexy is a muscular weakness that can be something as minor as some slackening of the facial muscles to dropping of the jaw to in severe instances, total collapse.Central Sleep Apnea
Sleep apnea caused by the brains inability to control the individuals breathing.Chronic Insomnia
Insomnia is considered to be chronic insomnia if it occurs nightly for a minimum of one month.Chronotherapy
Chronotherapy is used for the treatment of circadian rhythm sleep disorder (see definition). The patient's sleep and wake cycle are systematically changed so that there biological clock can be reset to more standard sleep times.Circadian Rhythm
This is roughly a 24 hour cycle in the physiological processes of an individual. It depends partially on external factors such as heat and sunlight.Continuous Positive Airway Pressure - CPAP
This device is used by people with sleep apnea and it provides a constant positive airway pressure while they are asleep to keep their airway open.CPAP Pressure
This is the amount of pressure needed to keep the airway open in a sleep apnea patient who is using a CPAP sleep machine. It is expressed in centimeters of water or cmH20. Depending on the patient this can range from 5 to 20 cmH20.Deep Sleep
This is sleep stage 3 and 4 of non-REM sleep.Delayed Sleep Phase Syndrome
This is a circadian rhythm disorder (see definition). The term is used when an individual's sleep wake cycle is delayed compared to what is considered a normal sleep cycle. Generally the individual goes to bed very late and has difficulty getting up in the morning.Dyssomnias
Sleep disorder that has the individual experiencing excessive sleepiness or insomnia.EPAP
See Expiratory Positive Airway Pressure.Epoch
During a sleep test this is a measurement of the duration of the sleep recording. It generally is 20 to 30 seconds which is approximately one page of the polysomnogram.Epworth Sleepiness Scale
Based on the patients perceptions the Epworth scale is an index of sleep propensity during the day. There are 8 questions that are completed.Esophageal Scale
This measurement determines respiratory effort and airway resistance. It is used in certain cases by sleep disorders centers when they are doing polysomnographic testing.Expiratory Positive Airway Pressure - EPAP
The prescribed pressure for the breathe out phase (expiratory) of an individual on Bi-level CPAP therapy for obstructive sleep apnea.Five Stages of Sleep
Stage 1 is the first sequence called drowsiness, stage 2 is a period of light sleep, stages 3 and 4 are the deep sleep stages with stage 4 the deeper sleep of the two, stage 5 sleep is REM ( Rapid Eye Movement ) sleep.Gastroesophageal Reflux Disease
This disease causes the individual to awaken multiple times per night due to stomach acid flowing upward into the persons throat while they are asleep.Histogram
A histogram is a graph that shows frequency distributions and is used by sleep technicians as a measure and evaluate a sleep study.Hyperirritability
Individuals who are sleep deprived may experience extreme irritability.Hypersomnia
The individual sleeps for extremely long periods of time that are way above the sleep periods of a average individual.Hypotonia
Temporary paralysis that is usually present during REM sleep. This prevents the individual from thrashing about or acting on their dreams.Hypoxia
An individual has an insufficient amount of oxygen reaching the tissues in their body.Insomnia
Defined as difficulty sleeping. Generally, there are 3 types of insomnia, transient, acute and chronic.Jet Lag
Jet lag is a physiological condition causes by an interruption of the individuals circadian rhythm (see definition). The term is generally used when individuals travel by air across different time zones and their bodies are unable to immediately adjust to the new daylight and darkness hours. Symptoms include loss of appetite, headache, fatigue and grogginess among others.Leg Movement
During a sleep study an individuals leg movements are recorded to test for restless legs syndrome.Maintenance of Wakefulness Test
This test is used to assess the individual's ability to remain awake and generally involves being placed in a darkened room in a semi-reclined position.Melatonin
This is a hormone secreted by the pineal gland.Narcolepsy
A neurological condition that includes excessive daytime sleepinness. An individual may fall asleep at inopportune times and places. Their nightime sleep may be fragmented.Night Terror
This is an extreme emotional episode in which the individual wakes up with fear and anxiety. Generally this occurs in children and they are often unable to remember the details of the incident that provoked the fears.Obstructive Sleep Apnea
The cessation of breathing while asleep of up to 10 seconds. Caused by obstruction in the upper throat or airway.Parasomnia
This term includes sleep arousal disorders such as sleepwalking, aggressive behavior while sleeping, and nightmares. Generally, treatable by medical intervention.REM Sleep
Rapid Eye Movement during sleep. This is sleep that is characterized by active brain waves and movement of the eyes. Dreaming occurs during this sleep stage.Restless Legs Syndrome
Also called RLS and is a sleep disorder caused by itchiness or a crawling sensation in the legs. This most likely occurs while the individual is not active. The symptoms are alleviated by movement.Sleep Debt
Occurs when the individual over time does not get a sufficient amount of restorative sleep.Sleep Deprivation
A chronic lack of sufficient restorative sleep.Sleep Disorder
This includes a wide range of sleep illnesses that have multiple causes and include physiological and psychological causes as well as a multitude of other sleep disturbances.Sleep Hygiene
Activities related to getting a good night's sleep. Some positive sleep hygiene habits include going to bed at the same time each night, reduced alcohol consumption, no large meals before bed and no caffeine 4 hours before going to sleep.Sleep Latency Test
A sleep latency test measures how easily a person is able to fall asleep.Sleep Paralysis
An individual awakens and is unable to move for a short period of time. They were likely awakened during the REM sleep stage where sleep paralysis is naturally induced by the body.Sleepwalking
Walking while asleep generally occurs during stages 3 and 4 sleep which is the deep sleep stage. Also called somnambulism.Somnambulism
Walking while asleep.Transient Arousal
Briefly awakening from sleep.Transient Insomnia
This is the mildest and probably the most common type of insomnia. It lasts from one night to several weeks and can be caused by jet lag or anxiety.Unintended Sleep Episode
An unplanned sleep episode that occurs such as falling asleep while riding a bus or subway or perhaps during a more dangerous activity such as driving.Upper Throat or Upper Airway
Part of the respiratory system that includes the palate, tongue, sinus passages, and nose.Uvula
The small soft tissue that hangs down at the back of the tongue before your throat. You can see your uvula by opening your mouth wide and looking close up in the mirror.White Noise Machines
In relation to sleep white noise machines produce a random sound that soothes the individuals and can mask other sounds such as conversation or other noises. The sound is generally like the sound of air escaping a balloon. Other sounds such as rain or ocean waves are also used to soothe the user.Pima Lung & Sleep, P.C. does not have an affiliation, connection, or association with any of the third parties referenced above, nor does any of these third parties sponsor, approve, or endorse Pima Lung & Sleep, P.C or its goods, services, or commercial activities. Furthermore, Pima Lung & Sleep, P.C does not sponsor, approve, or endorsement the goods, services, or commercial activities of the above third parties.
