Effects of Daylight Saving Time on Sleep
Author Information
Author(s): Tuuli A Lahti, Sami Leppämäki, Jouko Lönnqvist, Timo Partonen
Primary Institution: National Public Health Institute, Helsinki, Finland
Hypothesis
How do transitions into and out of daylight saving time affect sleep and rest-activity cycles?
Conclusion
Transitions out of and into daylight saving time enhanced night-time restlessness and compromised the quality of sleep.
Supporting Evidence
- Sleep efficiency was reduced after the fall transition.
- The movement and fragmentation index increased significantly after both transitions.
- Individuals with higher global seasonality scores suffered more from the transitions.
Takeaway
Changing the clocks for daylight saving time can make it harder for people to sleep well at night.
Methodology
Rest-activity cycles were measured using wrist-worn accelerometers, and participants filled in questionnaires and kept a sleep diary.
Potential Biases
Participants were all healthy and free of psychotropic medication, which may limit generalizability.
Limitations
The study had a small sample size and was limited to healthy individuals aged 20-40.
Participant Demographics
Nine healthy participants aged 20 to 40 years, including eight women and one man.
Statistical Information
P-Value
0.01
Confidence Interval
95% confidence interval not specified
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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