| http://www.w3.org/ns/prov#value | - Insomnia may be the effect of prescription or over-the-counter medications,7 or of a medical condition.11 In addition, insomnia may represent a prodromal indication of psychiatric illness (particularly depression),12 a sleep-related breathing disorder such as sleep apnea,13,14 a movement-related disorder such as restless leg syndrome15???17 or a circadian rhythm disorder.
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