Format

Send to

Choose Destination
J Clin Sleep Med. 2015 Aug 15;11(8):879-84. doi: 10.5664/jcsm.4938.

Adverse Effects of Daylight Saving Time on Adolescents' Sleep and Vigilance.

Author information

1
Weill Cornell Medical College Center of Sleep Medicine, Cornell University, New York, NY.
2
Harvard University Health Careers Program, Boston, MA.

Abstract

STUDY OBJECTIVES:

Daylight saving time (DST) has been established with the intent to reduce energy expenditure, however unintentional effects on sleep and vigilance have not been consistently measured. The objective of this study was to test the hypothesis that DST adversely affects high school students' sleep and vigilance on the school days following its implementation.

METHODS:

A natural experiment design was used to assess baseline and post-DST differences in objective and subjective measures of sleep and vigilance by actigraphy, sleep diary, sleepiness scale, and psychomotor vigilance testing (PVT). Students were tested during school days immediately preceding and following DST.

RESULTS:

A total of 40 high school students were enrolled in this study; 35 completed the protocol. Sleep duration declined by an average of 32 minutes on the weeknights post-DST, reflecting a cumulative sleep loss of 2 h 42 min as compared to the baseline week (p = 0.001). This finding was confirmed by sleep diary analyses, reflecting an average sleep loss of 27 min/night (p = 0.004) post-DST. Vigilance significantly deteriorated, with a decline in PVT performance post-DST, resulting in longer reaction times (p < 0.001) and increased lapses (p < 0.001). Increased daytime sleepiness was also demonstrated (p < 0.001).

CONCLUSION:

The early March DST onset adversely affected sleep and vigilance in high school students resulting in increased daytime sleepiness. Larger scale evaluations of sleep impairments related to DST are needed to further quantify this problem in the population. If confirmed, measures to attenuate sleep loss post-DST should be implemented.

KEYWORDS:

actigraphy; adolescent; daylight saving time; school; sleep; sleep deprivation; student; vigilance

PMID:
25979095
PMCID:
PMC4513265
DOI:
10.5664/jcsm.4938
[Indexed for MEDLINE]
Free PMC Article

Supplemental Content

Full text links

Icon for American Academy of Sleep Medicine Icon for PubMed Central
Loading ...
Support Center