Sleep Disorders Glossary M

Sleep Disorders Glossary - M


Macroglossia is a congenital disorder characterized by an abnormally large tongue; often seen in cases of Down's syndrome .

Maintenance Of Wakefulness Test/MWT

Maintenance of wakefulness test - also called MWT, a test that consists of four 20-minute trials are conducted every two hours and the patient is encouraged to stay awake.

Contrary to a MLST, the MWT is scored on the patient's capability to remain awake during the trials.


Marijuana - drug obtained from the flowering tops, stems, and leaves of the hemp plant, Cannabis sativa or C. indica , which contain an active ingredient called tetrahydrocanabinol (THC) that is euphorogenic. Some people use marijuana at bedtime as an aid to falling asleep.


Maxillofacial is relating to the upper jaw and face, particularly with reference to specialized surgery of the maxilla .

Maxillomandibular Advancement/MMA

Maxillomandibular Advancement (MMA), is sometimes called Bimaxillary Advancement (Bi-Max), or Maxillomandibular Osteotomy (MMO).

A surgical procedure, which moves the jaw top (maxilla) and bottom (mandible) forward. Used to correct facial deformity, receding chin, and for sleep breathing disorders.


Melatonin A hormone derived from serotonin and produced by the pineal gland that stimulates color change in the epidermis of amphibians and reptiles and plays a role in sleep, aging, and reproduction in mammals .

Mental Imagery

Mental imagery is the procedure of generateing images in the mind.


MESAM 4 is a type of portable recording device used in diagnostic sleep studies.


Micro-arousal is partial awakening from sleep. This is the period where a sleeper partially awakes, but is not aware of it.


Micro-sleep is the period of sleep that lasts up to a few seconds, usually experienced by people who have narcolepsy or are severely deprived of sleep .

Mixed Sleep Apnea

Mixed sleep apnea is the combination of central sleep apnea and obstructive sleep apnea.


Monocyclic is having a single major sleep period and a single major wake period in one 24-hour day.


Montage is the term related to the testing variables and their order on polysomnogram paper or a computer monitor, such as EOG, BPM, EEG, and so on.

Motor Activity In Sleep

Motor activity in sleep is any muscular movement during sleep.

Motor Atonia

Motor Atonia is the absences of any muscle activity during sleep. This is a normal phenomenon during REM sleep.

Movement Arousal

Movement Arousal is a body movement associated with an EEG pattern of arousal or a full awakening.


Myoclonus is sudden twitching of muscles or parts of muscles, without any rhythm or pattern, occurring in various brain disorders .

Multiple Sleep Latency Test [MSLT]

The Multiple Sleep Latency Test (MSLT) is a sleep disorder diagnostic tool. It is used to measure the time it takes from the start of a nap period to the first signs of sleep.

It can use used to test for narcolepsy, to distinguish between physical tiredness and true excessive daytime sleepiness, or to see if breathing disorder treatments are working.

The test consists of four or five, twenty-minute naps that are scheduled about two hours apart. The test is often done following an overnight sleep study. During the test things such as your brain waves, EEG, muscle activity and eye movements are monitored and recorded. The entire test normally takes about 7 hours.

Muscle Tone

Muscle Tone is the normal state of balanced tension in the tissues of the body, especially the muscles .


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