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BMC Physiol. 2008 Feb 12;8:3. doi: 10.1186/1472-6793-8-3.

Transitions into and out of daylight saving time compromise sleep and the rest-activity cycles.

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  • 1Department of Mental Health and Alcohol Research, National Public Health Institute, Helsinki, Finland.



The aim of this study was to analyze the effects of transition out of and into daylight saving time on the rest-activity cycles and sleep. Rest-activity cycles of nine healthy participants aged 20 to 40 years were measured around transitions out of and into daylight saving time on fall 2005 and spring 2006 respectively. Rest-activity cycles were measured using wrist-worn accelerometers. The participants filled in the Morningness-Eveningness and Seasonal Pattern Assessment Questionnaires before starting the study and kept a sleep diary during the study.


Fall transition was more disturbing for the more morning type and spring transition for the more evening type of persons. Individuals having a higher global seasonality score suffered more from the transitions.


Transitions out of and into daylight saving time enhanced night-time restlessness and thereby compromised the quality of sleep.

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