Why Your Sleep Is Impacted by Electric Lights – Healthline

March 18, 2022 by No Comments

  • A new report finds that electric light impacts the circadian rhythm in people and can disrupt sleep.
  • Experts explain how people should be exposed to bright light during the day and evening to contribute to healthy body rhythms, restful sleep, and daytime alertness.
  • Researchers say light affects our daily patterns of sleep and alertness through a specialized cell in the eye using a light-sensitive protein called melanopsin.

A new study published in the journal PLOS Biology says the light humans experience in daily life heavily influences body rhythms, with around-the-clock access to electric lights combined with reduced exposure to natural sunlight leading to disruptions in sleep.

According to the study, the combination negatively impacts human health, well-being, and productivity.

The research also recommends how people should be exposed to bright light during the day and evening to contribute to healthy body rhythms, restful sleep, and daytime alertness.

An international team of scientists led by Timothy Brown, PhD, from the UK’s University of Manchester, and Kenneth Wright, PhD, from the University of Colorado Boulder, have put together what they say is one of the first evidence-based, consensus recommendations for healthy daytime, evening, and nighttime light exposure.

“These recommendations provide the first scientific consensus, quantitative, guidance for appropriate daily patterns of light exposure to support healthy body rhythms, nighttime sleep, and daytime alertness,” Brown said in a statement. “This now provides a clear framework to inform how we light any interior space, ranging from workplaces, educational establishments, and healthcare facilities to our own homes.”

The guidelines will be meant to help lighting and electronics industries design healthier environments and improve how we light homes, workplaces, and public buildings.

The researchers say light affects our daily patterns of sleep and alertness through a specialized cell in the eye using a light-sensitive protein called melanopsin, which is different from proteins in the eye’s rods and cones supporting vision (upon which traditional ways of measuring “brightness” are based).

Melanopsin is most sensitive to light residing in a specific part of the visual spectrum (blue-cyan light). The team developed a new light measurement standard tailored to this unique property called melanopic equivalent daylight illuminance.

Researchers analyzed data across a range of laboratory and field studies, which they say proved that the new measurement approach can reliably predict the effects of light on human physiology and body rhythms.

By doing so, it could allow the team to form widely applicable and meaningful recommendations as to how we should use — and not use — light in our daily lives.

The researchers say their next step will be integrating recommendations into formal lighting guidelines, which currently focus on visual requirements rather than light’s effects on health and well-being.

They expect increasing sophistication in LED lighting technology and the availability of low cost light sensors to increase the ease with which people can optimize their personal light exposure to best support their own body rhythms.

A study published in the journal PNAS from the Center for Circadian and Sleep Medicine at Northwestern University Feinberg School of Medicine focuses on light’s negative effects on sleep and human health.

The researchers found that sleeping even just one night with a dim light, such as a TV set with the sound off, raised the heart rate and blood …….

Source: https://www.healthline.com/health-news/why-your-sleep-is-impacted-by-electric-lights

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