Continuous body temperature tracking in people with non-24-hour sleep-wake patterns

The low temperature zone is correlated with dim light melatonin onset in cases of non-24 h sleep-wake syndrome.

• The low temperature zone is defined as the period when rectal temperature falls below its daily mean.
• Identification of the low temperature zone helped in clinical assessments of non-24 h sleep-wake syndrome.
• The low temperature zone may assist in determining phase position in individuals with irregular sleep patterns.
• Calculating the low temperature zone could improve the timing of bright light therapy for affected individuals.

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