Insomnia is a sleep disorder characterized by persistent difficulties falling or staying asleep. It can be acute or chronic and may involve trouble with sleep initiation, duration, or quality, leading to daytime fatigue and impaired functioning. The term emphasizes inability to obtain adequate rest despite opportunities to sleep.
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Dysthymia
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Echolalia
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Eidetic
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Extraversion
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Hippocampus
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Hypnagogic
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Hypochondriasis
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Ideation
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Illusion
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Insomnia
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