A 77-year-old man with Alzheimer disease has six months of fragmented, multiple short sleep episodes throughout the day and night, leading to difficulty attending appointments and reduced family engagement. Which diagnosis best fits his presentation: chronic insomnia disorder, delayed sleep‑wake phase disorder, irregular sleep‑wake rhythm disorder, advanced sleep‑wake phase disorder, or periodic limb movement disorder?

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Last updated: February 14, 2026 • View editorial policy

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