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The current formal name established in the third edition of the International Classification of Sleep Disorders (ICSD-3) is delayed sleep-wake phase disorder. Earlier, and still common, names include delayed sleep phase disorder (DSPD), delayed sleep phase syndrome (DSPS), delayed sleep phase type (DSPT), and circadian rhythm sleep disorder. [37]
However, for a sleep phase delayed person, the time of biological morning and biological afternoon/evening might differ depending on the circadian clock shift in the affected person. This means that if melatonin is taken during the usual bedtime and wake-up time (i.e., usual nighttime), it may have no effect.
This is a shortened version of the fifth chapter of the ICD-9: Mental Disorders.It covers ICD codes 290 to 319.The full chapter can be found on pages 177 to 213 of Volume 1, which contains all (sub)categories of the ICD-9.
This is a list of major and frequently observed neurological disorders (e.g., Alzheimer's disease), symptoms (e.g., back pain), signs (e.g., aphasia) and syndromes (e.g., Aicardi syndrome). There is disagreement over the definitions and criteria used to delineate various disorders and whether some of these conditions should be classified as ...
Circadian rhythm sleep disorders were discovered in 1981 by Weitzman as delayed sleep phase syndrome in contrast to advanced sleep phase syndrome in 1979. [ 7 ] Evolution of classifications of sleep disorders
Delayed sleep phase disorder, a circadian rhythm disorder, formerly named DSPS Died without surviving issue , (Latin: d.s.p. suivre ) D'jermaya Solar Power Station , a solar power plant in Chad