The relationship between insomnia and body temperatures

Different types of insomnia symptoms are associated with abnormalities in the body's temperature rhythm.

• Sleep is most conducive when core body temperature is at its lowest.
• Sleep onset insomnia may occur during a delayed evening wake maintenance zone due to a delayed temperature rhythm.
• Morning bright light treatment has been effective in phasing advance circadian rhythms for sleep onset insomnia.
• Early morning awakening insomnia is linked to a phase advanced temperature rhythm and can be treated with evening bright light.
• Sleep maintenance insomnia is associated with elevated core body temperature rather than circadian rhythm timing issues.
• A combination of sleep onset and maintenance insomnia correlates with a sustained 24-hour elevation of core body temperature.

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