Story perspectives

Brighter Daylight Helps Adults Sleep Earlier, Gain Deep Rest

7/20/2026

Summary

Story summary

University of Manchester researchers reported that brighter daytime light made adults fall asleep earlier, wake earlier, and get more early-night deep sleep.
The NPJ Biological Timing and Sleep study used over 500 days of data from 89 adults wearing wrist-mounted light sensors and sleep trackers.
Jennifer Martin, Ph.D., recommended morning sunlight, limited evening light, consistent wake-times within one hour, and at least seven hours of sleep nightly.

1 of 1

Story summary

University of Manchester researchers reported that brighter daytime light made adults fall asleep earlier, wake earlier, and get more early-night deep sleep.
The NPJ Biological Timing and Sleep study used over 500 days of data from 89 adults wearing wrist-mounted light sensors and sleep trackers.
Jennifer Martin, Ph.D., recommended morning sunlight, limited evening light, consistent wake-times within one hour, and at least seven hours of sleep nightly.