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Night owl sleep study12/25/2023 ![]() They also underwent polysomnography, a lab-based sleep study that takes more in-depth measurements of overnight sleep patterns. Fifteen years into the study, about 3,000 of those women underwent actigraphy, whereby a watch-like device worn on the wrist measures sleep by recording movement over several days. ![]() Yaffe and colleagues followed a prospective, multicenter cohort of community-dwelling women, all of whom were 65 or older and free of dementia at enrollment. ![]() Kristine Yaffe, University of California, San Francisco, presented her recent epidemiological findings on sleep-some published and some not. “Sleep disruptions throughout the lifespan are probably accelerators of cognitive aging and risk factors for dementia,” he said. “It is unusual to have studies coming together at the same time to say the same thing,” said Constantine Lyketsos, Johns Hopkins Bayview Medical Center, Baltimore, Maryland. In particular, objective sleep measures suggesting that sleep disorders predict decline added a new layer of experimental data to older self-reported hints that how long and how well one sleeps might affect brain health later in life. Since sleep is essential for optimal performance, health, and well-being, it's important to develop strategies to get better rest," says Boivin, who is also the Director of the Centre for Study and Treatment of Circadian Rhythms at The Douglas Research Centre.Īs next steps, the researchers hope to study the impact of chronotype and shift work on other health outcomes.At the Alzheimer’s Association International Conference held 14-19 July 2012 in Vancouver, Canada, both epidemiological and lab findings converged to point a finger at sleep in connection to cognitive decline. "People involved in shift work experience an increased risk of sleep disturbances and fragmented sleep periods. Such strategies could include work schedules that consider chronobiological principles. The findings could help design strategies to improve sleep in workers with atypical schedules, the researchers say. Generally, early risers slept less after night shifts compared to night owls-but they also took more naps prior to their night shifts, so their total daily sleep was similar. While shift workers take naps to reduce the effect of their irregular schedules on their sleep, the researchers found this behavior was more prominent during night shifts in early risers. On average early risers sleep 1.1 hours longer on morning shifts, while night owls sleep two hours longer on evening shifts," says co-author Laura Kervezee, a former Postdoctoral Fellow at The Douglas Research Centre affiliated with McGill University. "Our results suggest that the effect of chronotype on sleep duration and napping behavior depends on the shift type. For close to a month, the officers wore a watch-like device, allowing researchers to measure their sleep. To investigate this relationship, the researchers tracked 74 police officers as they worked their usual shifts. Their study published in Sleep is the first to examine the relationship between chronotype and sleep behavior in shift workers during morning, evening, and night shifts. Boivin, a Professor in the Department of Psychiatry at McGill University. This preference, called chronotype, is modulated by our circadian system-each person's unique internal timekeeper," says lead author Diane B. "Some people seem to be hardwired to sleep early, while others tend to sleep late.
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