Trouble falling asleep at night? Chase that daytime light, study shows

A new study reports that college students in Seattle fall asleep later and wake up later in winter, likely because — as the study also found — in winter the students received less daylight exposure. The researcher say that outside in the morning, even on cloudy days, is the best way to prevent this circadian rhythm “delay.”

Light Therapy Improves Breast Cancer Survivors’ Sleep

Cancer alters the circadian rhythm functions, which results in fatigue and disrupted sleep/wake patterns. ​​​​​​​​​​​​​​Dr. Horng-Shiuann Wu studies how using extremely bright light to “reset” a female breast cancer patient’s internal clock can help them sleep better.​​​​​​​