![]() As shown, day-shift and rotating-shift nurses exhibit remarkably different levels of behavioural circadian entrainment/disruption. Phasor analysis combines the measured periodic activity-rest patterns with the measured periodic light-dark patterns to assess behavioural circadian entrainment/disruption. When the Daysimeter is worn on the head, two light sensors near the eye are used to estimate circadian light (CLA) exposures over extended periods of time. Presented is an overview of the recently developed Daysimeter, a personal measurement device for recording activity and circadian light-exposure. ![]() Therefore, it is important to measure circadian light exposures over the course of the 24-hour day and to be able to assess circadian entrainment and disruption in actual living environments. Lack of synchronization between the endogenous clock and the local time has been associated with a host of maladies. ![]() Lighting characteristics affecting circadian rhythms are very different than those affecting visual responses. The 24-hour patterns of light and dark on the retina synchronize circadian rhythms to the local time on earth. In humans, circadian rhythms have an average period of 24.2 hours. Circadian rhythms are biological rhythms that repeat at approximately 24 hours.
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