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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.
Delta Waves - Delta waves have a frequency of 2 cycles per second (cps) or slower and amplitudes greater than 75 microvolts peak to peak (the difference between the most negative and positive points of the wave). Also known as Delta Activity.
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.
DME - (Durable Medical Equipment) - Devices such as wheelchairs and walkers, which are prescribed on the order of a physician. This includes CPAP and Bi-Level machines.
Drowsiness, Drowsy - A state of quiet wakefulness that typically occurs prior to sleep onset. If the eyes are closed, diffuse and slowed alpha activity usually is present, which then gives way to early features of stage 1 sleep.
Dyssomnias - A class of sleep disorders that produce either insomnia or excessive sleepiness.
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