circadian rhythm sleep disorder

in DSM–IV–TR, a sleep disorder that is due to a mismatch between the sleep–wake schedule required by a person’s environment or occupational circumstances (e.g., shift work) and his or her circadian sleep–wake pattern, resulting in excessive sleepiness or insomnia. This disorder was formerly called sleep–wake schedule disorder. DSM–5 calls it circadian rhythm sleep–wake disorder. See dyssomnia. See also disorders of the sleep–wake cycle schedule.

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Psychology term of the day

November 15th 2024

colorimeter

n. an instrument used to compare, identify, or reproduce colors by comparison with a known mixture of monochromatic and white lights or a mixture of the three primary colors.