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Transitions Into and Out of Daylight Saving Time Compromise Sleep and the Rest-Activity Cycles

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Transitions Into and Out of Daylight Saving Time Compromise Sleep and the Rest-Activity Cycles

Tuuli A Lahti et al. BMC Physiol.

Abstract

Background: 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.

Results: 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.

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

Figures

Figure 1
Figure 1
Changes in sleep efficiency (SE) and movement and fragmentation index (FI) in MES-subgroups/Fall. Before = mean for four days before transition, After 1,2,3 and 4 = means for the days after transition. Eve = MES-subgroup evening type, Morn = MES-subgroup morning type.
Figure 2
Figure 2
Changes in sleep efficiency (SE) and movement and fragmentation index (FI) in MES-subgroups/Spring. Before = mean for four days before transition, After 1,2,3 and 4 = means for the days after transition. Eve = MES-subgroup evening type, Morn = MES-subgroup morning type.
Figure 3
Figure 3
Changes in relative amplitude (RA), intra-daily stability (IS) and intra-daily variability (IV) in MES-subgroups/Fall. Before = mean for four days before transition, After 1&2 is mean for two days after transition, After 3&4 = is mean for the days three and four after transition. Eve = MES-subgroup evening type, Morn = MES-subgroup morning type.
Figure 4
Figure 4
Changes in relative amplitude (RA), intra-daily stability (IS) and intra-daily variability (IV) in MES-subgroups/Fall. Before = mean for four days before transition, After 1&2 is mean for two days after transition, After 3&4 = is mean for the days three and four after transition. Eve = MES-subgroup evening type, Morn = MES-subgroup morning type.
Figure 5
Figure 5
Changes in sleep efficiency (SE) and movement and fragmentation index (FI) in GSS-subgroups/Fall. Before = mean for four days before transition, After 1,2,3 and 4 = means for the days after transition. Not seasonal = GSS-subgroup not seasonal, seasonal = GSS-subgroup seasonal.
Figure 6
Figure 6
Changes in sleep efficiency (SE) and movement and fragmentation index (FI) in GSS-subgroups/Fall. Before = mean for four days before transition, After 1,2,3 and 4 = means for the days after transition. Not seasonal = GSS-subgroup not seasonal, seasonal = GSS-subgroup seasonal.
Figure 7
Figure 7
Changes in relative amplitude (RA), intra-daily stability (IS) and intra-daily variability (IV) in GSS-subgroups/Fall. Before = mean for four days before transition, After 1&2 is mean for two days after transition, After 3&4 = is mean for the days three and four after transition. Not seasonal = GSS-subgroup not seasonal, seasonal = GSS-subgroup seasonal.
Figure 8
Figure 8
Changes in relative amplitude (RA), intra-daily stability (IS) and intra-daily variability (IV) in GSS-subgroups/Spring. Before = mean for four days before transition, After 1&2 is mean for two days after transition, After 3&4 = is mean for the days three and four after transition. Not seasonal = GSS-subgroup not seasonal, seasonal = GSS-subgroup seasonal.

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