Right light at the right time can improve sleep as you age? Study reveals the expert trick you need to know

Struggling to sleep as you age? Science says this simple light trick can fix it.

Getting older brings many changes—unfortunately, disrupted sleep is often one of them. Many seniors struggle with falling asleep, waking up frequently and feeling less rested overall, but what if the solution was as simple as adjusting light exposure?

A new groundbreaking study from the University of Surrey, published in GeroScience, suggested that the timing of light exposure plays a crucial role in sleep quality for older adults. Researchers found that morning exposure to blue-enriched light can enhance sleep and daily activity, while the same light in the evening can have the opposite effect.

The science behind light and sleep

As we age, our eyes naturally change—the lens yellows, pupils shrink, and we lose some light-sensitive photoreceptor cells. These changes reduce the amount of light, especially blue wavelengths (420-480 nm), that reach the brain’s master clock in the hypothalamus.

Exposure to light while sleeping can have harmful effects on health.

Since blue light helps regulate our body’s internal clock, its reduced presence can lead to weaker sleep-wake cycles. Additionally, many seniors spend less time outdoors and more time exposed to artificial light in the evenings, further disrupting their sleep patterns.

The study: How light exposure affects sleep

The study revealed the following key findings:

• Morning exposure to blue-enriched light improved sleep stability and reduced nighttime wake-ups.
• Evening exposure to blue light disrupted sleep, making it harder to fall asleep and reducing sleep quality.
• Participants who spent more time in bright natural light (above 2,500 lux) had stronger daily rhythms and earlier bedtimes.
• Women had more variable activity patterns throughout the day than men.
• Those who napped more had weaker daily rhythms and were less active overall.

Practical tips for better sleep

The good news? These findings suggest simple, non-medication solutions for improving sleep in older adults:

1. Increase morning blue-light exposure: Use a lightbox or spend time outdoors after waking up.
2. Reduce blue-light exposure in the evening: Dim indoor lighting and avoid screens before bedtime.
3. Maintain a consistent schedule: Establishing morning and evening routines can further support healthy sleep patterns.

A new approach to sleep health

Study author Daan Van Der Veen emphasised, “Carefully timed light exposure can be a powerful tool for improving sleep and activity levels in older adults.” This approach is not just for those in assisted living—it is effective for healthy, independent seniors as well.

Exposure to light helps the brain with alertness cues- which further helps in regulating the sleep wake cycle of the body. This helps us to sleep better. 

As populations continue to age, optimising light exposure could become a key strategy for promoting better sleep and overall well-being. With simple adjustments, seniors can reclaim restful sleep—one morning sunrise at a time.

Note to readers: This article is for informational purposes only and not a substitute for professional medical advice. Always seek the advice of your doctor with any questions about a medical condition.