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.
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.
Authors: Miguel Marino; Yi Li; Michael N Rueschman; J W Winkelman; J M Ellenbogen; J M Solet; Hilary Dulin; Lisa F Berkman; Orfeu M Buxton Journal: Sleep Date: 2013-11-01 Impact factor: 5.849
Authors: Colleen E Carney; Daniel J Buysse; Sonia Ancoli-Israel; Jack D Edinger; Andrew D Krystal; Kenneth L Lichstein; Charles M Morin Journal: Sleep Date: 2012-02-01 Impact factor: 5.849
Authors: Lisa M Fucito; Krysten W Bold; Eliza Van Reen; Nancy S Redeker; Stephanie S O'Malley; Tess H Hanrahan; Kelly S DeMartini Journal: J Abnorm Psychol Date: 2017-11-27
Authors: Anthony D Okely; Davina Ghersi; Sarah P Loughran; Dylan P Cliff; Trevor Shilton; Rachel A Jones; Rebecca M Stanley; Julie Sherring; Natalie Toms; Simon Eckermann; Timothy S Olds; Zhiguang Zhang; Anne-Maree Parrish; Lisa Kervin; Sandra Downie; Jo Salmon; Clair Bannerman; Tamie Needham; Elaine Marshall; Jordy Kaufman; Layne Brown; Janecke Wille; Greg Wood; David R Lubans; Stuart J H Biddle; Shane Pill; Anthea Hargreaves; Natalie Jonas; Natasha Schranz; Perry Campbell; Karen Ingram; Hayley Dean; Adam Verrender; Yvonne Ellis; Kar Hau Chong; Dorothea Dumuid; Peter T Katzmarzyk; Catherine E Draper; Hayley Lewthwaite; Mark S Tremblay Journal: Int J Behav Nutr Phys Act Date: 2022-01-06 Impact factor: 6.457
Authors: Giulia Zerbini; Vincent van der Vinne; Lana K M Otto; Stefanie Monecke; Thomas Kantermann; Martha Merrow Journal: J Biol Rhythms Date: 2019-09-23 Impact factor: 3.182