New research indicates that increased exposure to bright, consistent daylight may lead to improved sleep patterns, including earlier bedtimes and deeper sleep.
A recent study conducted by researchers at the University of Manchester suggests that spending more time in bright daylight could significantly enhance sleep quality for adults. The study, which involved 89 participants, found a correlation between brighter, more consistent daytime light exposure and earlier sleep onset, as well as increased deep sleep during the night.
The findings, published in the journal NPJ Biological Timing and Sleep, were derived from over 500 days of data collected through light sensors and sleep trackers worn by participants, who also maintained daily sleep diaries.
According to the study, individuals who experienced greater exposure to bright daylight generally fell asleep and woke up earlier compared to those with less light exposure. Moreover, those with consistent exposure to daylight exhibited healthier sleep timing and enjoyed more deep sleep in the early part of the night.
Jennifer Martin, Ph.D., a clinical psychologist and professor at Florida International University’s Herbert Wertheim College of Medicine, commented on the study’s implications. Although she was not involved in the research, she noted that the findings align with existing knowledge about the impact of light on the body’s internal clock.
“Light impacts human sleep through a specific pathway, starting with the eye,” Martin explained. “When light hits specific cells in the retina, it communicates to the brain that it’s daytime, meaning we should be alert and active.”
Martin emphasized the importance of morning light, stating that it helps maintain a consistent sleep-wake cycle. She recommends spending time outdoors early in the day whenever possible. “Exposure to sunlight early in the day is really good for healthy sleep,” she said. “Regular morning light helps people feel sleepy around the same time each evening and build a strong sleep routine.”
In addition to seeking morning light, Martin advised limiting bright light exposure in the evening to further improve sleep quality. She suggests avoiding bright light during the last couple of hours before bedtime and maintaining a consistent wake-up time each morning.
“Varying your wake time by more than about one hour can lead to feelings of ‘jet lag’ and contribute to trouble with regularly sleeping well,” Martin cautioned. She also noted that adults should aim for at least seven hours of sleep each night and seek assistance from a sleep specialist if sleep issues become chronic.
While the study’s findings suggest that increased exposure to bright daylight may support healthier sleep patterns, the researchers acknowledged several limitations. They pointed out that the study established an association between daytime light exposure and sleep patterns but did not prove a direct causal relationship.
Additionally, the researchers measured light exposure using wrist-worn devices rather than at the eyes, where light directly influences the body’s internal clock. They also did not account for other factors, such as physical activity or meal timing, which could potentially affect sleep.
As the research continues to unfold, the implications of these findings could lead to new recommendations for improving sleep hygiene through natural light exposure.
For more insights on sleep and health, consult with a healthcare professional or sleep specialist.
According to Fox News Digital, the study highlights the importance of light exposure in regulating sleep patterns.