Sleep Disorders Glossary R

Sleep Disorders Glossary - R

Radio Frequency

Radio Frequency - Electromagnetic radiation in the frequency range 3 kilohertz (kHz) to 300 gigahertz (GHz). It is generally considered to include microwaves and radio waves.

These are range of electromagnetic waves with a frequency or wavelength suitable for utilization in radio communication . The primary health effects of radiofrequency energy are considered to be thermal. The absorption of radiofrequency energy varies with frequency.

Radio Frequency (RF) Procedure / Somnoplasty

Radio frequency produce is a unique surgical method for reducing habitual snoring by removing tissues of the uvula and soft palate. It is a surgical procedure for treating nasal obstruction, snoring and in some cases, sleep apnea.

The procedure uses radio-wave energy to reduce snoring and the size of the soft palate. This is also known as Somnoplasty.

Radio Frequency Tissue Ablation

Radio Frequency Tissue Ablation is a method that uses radio-frequency waves via a needle electrode placed under the surface of the tissue, resulting in contraction and subsequent shrinkage of excessive tissues that cause snoring.

Rebound Insomnia

Rebound insomnia is the sleep difficulties after stopping the use of a hypnotic medication.

Recurrent Hypersomnia

Recurrent hypersomnia is a sleep disorder of excessive sleepiness that occurs weeks or months apart. It is often accompanied with other disorders such as hypersexuality or compulsive eating.

Relaxation Therapy

Relaxation therapy is one of the various methods or techniques for the alleviation of insomnia that help to relax the mind and the body and which can make easy sleep onset. It is also termed relaxation imagery

REM-Associated Disorders

REM-Associated Disorders are the sleep disturbances that take place during REM sleep.

REM Density

REM Density is the frequency of eye movements per unit of time during REM sleep.

REM Latency

REM latency is the period of time in the sleep period from sleep onset to the first appearance of REM sleep.

REM Onset

REM Onset is the description for commencement of a REM period.

REM Percent

REM percent is the ratio of total sleep time comprised by the REM stage of sleep.

REM Period / REM Sleep Period

REM period is the REM portion of a NREM-REM cycle; early in the night it may be as short as a half-minute, whereas in later cycles longer than an hour.

There are typically 4-6 REM sleep episodes during an entire sleep period. Early episodes may be only several minutes in duration. Later REM episodes are usually longer, lasting 20 to 60 minutes.

REM Rebound Or Recovery

REM Rebound or Recovery lengthening and increase in frequency and density of REM periods, which results in an increase in REM percent above base line. REM rebound follows REM deprivation once the inhibitory influence is removed.

REM Sleep / Rapid Eye Movement Sleep

Rapid eye movement sleep is recurring sleep state during which dreaming occurs. Sleep is a periodic state of rest during which consciousness of the world is suspended.

The most significant characteristic of sleep, which differentiates it from the waking state, is the interruption of perception; a sleeping person does not see or hear.

REM Sleep Behavior Disorder

The exact cause of REM sleep behavior disorder (RBD) is unknown; although the REM sleep behavior disorder may occur in association with various degenerative neurological conditions such as multisystem atrophy, diffuse Lewy body dementia, Parkinson disease and Shy-Drager syndrome.REM Sleep Intrusion

REM Sleep Intrusion is a short interval of REM sleep appearing out of its usual positioning in the NREM sleep cycle.

REMS Motor Atonia

REMS Motor Atonia is the active suppression of activity in the antigravity and voluntary muscles during REM sleep. The muscles are completely flaccid and limp .

Respiratory Care Practitioner (RCP)

Respiratory Care Practitioner (RCP) is a licensed health care professional, who is specifically trained in cardiopulmonary assessment, diagnostics, therapy administration, and patient education, including the identification and treatment of sleep disorders.

Respiratory Disturbance Index (RDI)(Apnea/Hypopnea Index)

Respiratory Disturbance Index (RDI)(Apnea/Hypopnea Index) is the frequency of abnormal respiratory events per hour of sleep. It is the record of the number and duration of apnea episodes, both obstructive and central, during each hour of sleep. An RDI of greater than 5 is regarded as abnormal.

Restless Legs Syndrome [RLS]

Restless leg syndrome is a common cause of painful legs. Restless Legs Syndrome (RLS) is a neurological disorder in which patients experience irrepressible sensations in the legs or arms while sitting or lying still. It is also called as RLS.


Restlessness (Referring to Quality of Sleep) is constant or repeated body movements, arousals, or brief awakenings in the course of sleep.


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