6 topics with concise breakdowns: definitions, key facts, and class questions.
This chapter is dedicated to somnology, one of the most clinically important fields in neurology. Humans spend a third of their lives sleeping, and any disruptions in this process lead to severe somatic and cognitive consequences.
The material is structured from basic neurobiology to specific pathology. First, we will review normal sleep physiology and EEG phases, and then analyze key syndromes: insomnia, narcolepsy, obstructive sleep apnea syndrome (OSAS), various parasomnias, and restless legs syndrome.
During clinical case discussions and exams, instructors most frequently ask about the diagnostic tetrad of narcolepsy, polysomnography patterns in apnea, and the differential diagnosis of parasomnias versus nocturnal epileptic seizures. Pay special attention to insomnia treatment algorithms and the pathogenesis of restless legs syndrome—patients with these complaints will present to you in virtually every outpatient appointment.
Which brain structure serves as the internal pacemaker for the circadian rhythm?
Suprachiasmatic nucleus of the hypothalamus. It acts as the internal pacemaker, controlling other hypothalamic nuclei, the brainstem, and the thalamus.
What is the difference between acute and chronic insomnia?
Acute insomnia is diagnosed if symptoms last for up to one month. If sleep disturbances persist for more than a month, the condition becomes chronic.
At what age does narcolepsy most commonly begin?
Manifestation of the disease most commonly occurs in adolescence and young adulthood. Onset in childhood or middle age is significantly less common.
Why is the disease characterized by low detection rates?
Many microarousals due to respiratory arrests occur unconsciously. The patient may sleep unaware of their snoring and breathing pauses until family members inform them.
What apnea index value is considered diagnostically significant?
The diagnosis is established if the apnea-hypopnea index is greater than 5. This means 5 or more breathing cessations lasting over 10 seconds per hour.
From what age is it appropriate to diagnose nocturnal enuresis?
The diagnosis is established only if symptoms persist in children older than 4–5 years.
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