Manchester Study Links 89 Adults' Brighter Daylight to Earlier Sleep and More Deep Sleep
Updated
Updated · Fox News · Jul 19
Manchester Study Links 89 Adults' Brighter Daylight to Earlier Sleep and More Deep Sleep
2 articles · Updated · Fox News · Jul 19
Summary
More than 500 days of data from 89 adults showed that brighter, more consistent daytime light exposure was tied to earlier sleep onset, earlier wake times and more deep sleep early in the night.
Wrist-worn light sensors, sleep trackers and daily diaries underpinned the University of Manchester study, published in NPJ Biological Timing and Sleep.
Jennifer Martin of Florida International University said the results fit established sleep science: morning light helps set the body's internal clock, while bright light in the last couple of hours before bed can disrupt it.
The researchers said the study found an association, not proof of causation, and noted limits including wrist-based light measurement and untracked factors such as exercise and meal timing.