Insomnia in circadian dysrhythmias.

Insomnia is a common symptom of disordered sleep, often linked to conflicts between an individual's sleep-wake cycle and their environment.

• The causes of insomnia are complex and can include a mismatch between internal sleep patterns and external schedules.
• Sleep patterns are influenced by both a circadian rhythm, which oscillates over a 24-hour cycle, and a homeostatic process that regulates sleep need.
• Understanding the physiology of the circadian system may help in identifying different clinical manifestations of circadian rhythm sleep disorders.
• Effective treatment for insomnia may depend on accurate diagnosis of its underlying causes.

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