Sleep Science: Circadian Rhythms and Health

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## TL;DR

Sleep is regulated by two processes: circadian rhythm (the ~24-hour internal clock driven by the suprachiasmatic nucleus) and sleep-wake homeostasis (adenosine buildup creating "sleep pressure"). Adults need 7-9 hours of sleep; chronic deprivation (<6 hours) raises cardiovascular risk by 48%, impairs cognitive performance equivalent to 0.10% blood alcohol, and increases all-cause mortality by 13% (meta-analyses, 2020-2024).

## Core Explanation

The circadian clock is synchronized by light via intrinsically photosensitive retinal ganglion cells (ipRGCs) signalling the SCN. Blue light (450-480nm) suppresses melatonin; this is why screen use before bed disrupts sleep. Sleep stages: NREM 1-3 (restorative, memory consolidation) and REM (dreaming, emotional processing). Key sleep disorders: insomnia (10-15% of adults), sleep apnea (affecting ~1 billion globally per ResMed 2023 estimate), and circadian rhythm sleep-wake disorders. The Nobel Prize in Physiology/Medicine 2017 was awarded to Hall, Rosbash, and Young for molecular mechanisms of the circadian clock. CDC and Sleep Foundation provide evidence-based sleep hygiene recommendations.

## Detailed Analysis

[详细分析、统计数据、历史发展和进一步阅读。待后续补充。]

## Further Reading

- [Source 1 — Sleep Science: Circadian Rhythms and Health](https://www.sleepfoundation.org/)

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