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  • Lots of Neuro-Psych Terms
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• Sleep Related Terms

- D -

• Deep Sleep

Refers to combined non-REM sleep stages 3 and 4 in sleep studies



• Delayed sleep phase

A condition occurring when the clock hour at which sleep normally occurs is moved back in time in a given, 24 hour sleep-wake cycle. The result is a temporarily displaced (delayed) occurrence of sleep within the 24 hour cycle.



• Delta sleep

Stage(s) of sleep in which EEG delta waves are prevalent or predominant (sleep stages 3 and 4, respectively).



• Delta waves

EEG activity with a frequency less than 4 Hz. In human sleep stage scoring, conventionally the minimum criteria for scoring delta waves is 75 uV (peak-to-peak) amplitude, and 0.5 second duration (2 Hz).



• Diagnostic Sleep Study

Monitoring of several physiological activities in a sleeping individual. Usually performed to determine the absence or presence of a specific sleep disorder. The sleep study can occur in a sleep disorders center or in a patient's home with portable recording equipment.



• Diaphragm

Large, concave muscle attached to the rib cage at bottom of the chest (top of the abdomen). Inhalation occurs when diaphragm contracts. Exhalation is passive as the muscle relaxes.



• Diurna

Lactive and wakeful in the daytime versus active in the nighttime



• DME - Durable Medical Equipment

Equipment such as wheelchairs and walkers which are prescribed for use by or on the order of a physician, also includes CPAP and BI-Level machines.



• Drowsiness

Drowsyquiet wakefulness occurring prior to sleep onset.



• Dyssomnia

A disorder of sleep or wakefulness; not a parasomnia