101
edits
Changes
→D, E, F
'''Deep Sleep (Delta Sleep) (Slow Wave Sleep)''' - In sleep studies, refers to combined non-REM sleep stages 3 and 4.
'''Delayed Sleep Phase Syndrome''' - A circadian rhythm disorder, which in the daily sleep/wake cycle, is delayed with respect to clock time. Accordingly, the sleep phase occurs well after the conventional bedtime. Usually associated with difficulty getting up in the morning.
'''Delta Sleep (Deep Sleep) (Slow Wave Sleep)''' - Sleep stages 3 and 4 in which EEG delta waves are prevalent.
'''Diagnostic Sleep Study''' - Continuous monitoring of several physiological activities in a sleeping individual. Usually carried out to determine the absence or presence of a specific sleep disorder. A diagnostic sleep study can be performed in a sleep disorders center or in a patient's home with portable recording equipment.
'''Diaphragm''' - The large, concave muscle attached to the rib cage at bottom of the chest (top of the abdomen). Inhalation occurs when the diaphragm contracts. Exhalation is usually passive as the muscle relaxes.
'''Diurnal''' - Active and wakeful in the daytime, as opposed to active in the nighttime.
'''Electrooculogram (EOG)''' - A recording of the movements of the eyes. If rapid eye movements are detected during sleep, the subject is in REM sleep, which is the state in which vivid dreaming takes place. EOG is recorded in both diagnostic and CPAP titration sleep studies.
'''EPAP - (Expiratory Positive Airway Pressure)''' - The pressure prescribed for the expiratory (breathing out) phase of an individual on Bi-level CPAP therapy for OSA (obstructive sleep apnea).
'''Epidemiology''' - The scientific discipline that studies the incidence, distribution, and control of disease in a population. Includes the study of factors that affect the progress of an illness, and, in the case of many chronic diseases, their natural history.
'''Excessive Daytime Sleepiness (EDS, Somnolence, Hypersomnia)''' - A subjective report of difficulty in maintaining the awake state, accompanied by a ready entrance into sleep when the individual is sedentary; may be quantitatively measured by use of subjectively defined rating scales of sleepiness.
'''Expiratory Phase''' - The phase of the breathing cycle in which air is expelled.
'''Fragmentation (pertaining to Sleep Architecture)''' - The interruption of a sleep stage due to the transition to a lighter stage, or to wakefulness, leading to disrupted sleep cycles.
== G, H, I ==
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