It turns out that your annoying friend who insists on closing all of the window blinds and covering all of the glowing electronics in a bedroom in order to sleep in total darkness is onto something. New research bolsters the well-established theory linking nighttime light to adverse health impacts.
A preliminary analysis set to be presented at the American Heart Association’s Scientific Sessions 2025, starting Friday, suggests that the state of darkness while we sleep plays a crucial role in our overall health. The results link more artificial light at night, also known as artificial nighttime light pollution, with higher brain stress signals, inflamed blood vessels, and greater risk of heart disease—a broad term for different heart problems.
“We know that environmental factors, such as air and noise pollution, can lead to heart disease by affecting our nerves and blood vessels through stress. Light pollution is very common; however, we don’t know much about how it affects the heart,” Shady Abohashem, head of cardiac PET/CT imaging trials at Massachusetts General Hospital and senior author of the yet-unpublished study, said in a statement by the American Heart Association.
Artificial nighttime brightness at home
In the observational study, Abohashem and his colleagues reviewed the health data of 466 adults who had undergone the same combined Positron Emission Tomography/Computed Tomography (PET/CT) scan at Massachusetts General Hospital in Boston between 2005 and 2008 to identify stress signals in the brain and evidence of artery inflammation. They also investigated the adults’ exposure to artificial nighttime brightness at their homes via the 2016 New World Atlas of Artificial Night Sky Brightness.
The researchers found that people who experienced greater amounts of nighttime artificial light had higher brain stress activity, blood vessel inflammation, and a greater chance of developing heart disease. Unsurprisingly, the risk of heart issues was increased among participants who lived in areas with additional stress factors like significant traffic noise or lower neighborhood income. By the end of 2018, 17% of the adults had experienced significant heart problems.
“We found a nearly linear relationship between nighttime light and heart disease: the more night-light exposure, the higher the risk. Even modest increases in night-time light were linked with higher brain and artery stress,” Abohashem explained. The correlation remained even after researchers adjusted for known heart risk factors and other socio-environmental stresses.
“When the brain perceives stress, it activates signals that can trigger an immune response and inflame the blood vessels,” he added. “Over time, this process can contribute to hardening of the arteries and increase the risk of heart attack and stroke.”
Put the phone down
So what can we do about it? Cities could diminish unnecessary external lighting, and individuals could lessen indoor nighttime light before going to bed, according to Abohashem. That includes screens, which means no more scrolling on TikTok before snoozing.
“We know too much exposure to artificial light at night can harm your health, particularly increasing the risk of heart disease. However, we did not know how this harm happened,” said Julio Fernandez-Mendoza, who is director of behavioral sleep medicine at Pennsylvania State University College of Medicine and was not involved in the study. “This study has investigated one of several possible causes, which is how our brains respond to stress. This response seems to play a big role in linking artificial light at night to heart disease.”
However, the study has some limitations, according to the statement. For example, the participants were drawn from a single hospital system, so the group may lack diversity, and the results might not reflect the broader population. Furthermore, because of the nature of an observational study, it can’t prove that the associations are causal.
“We want to expand this work in larger, more diverse populations, test interventions that reduce nighttime light, and explore how reducing light exposure might improve heart health,” Abohashem concluded.
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![Exclusive: Redwood Materials lays off 10% in restructuring to chase energy storage business | TechCrunch
Redwood Materials has laid off around 135 employees, or roughly 10% of its workforce, as it restructures to better accommodate its growing energy storage business, TechCrunch has learned.
The cuts come just five months after Redwood cut 5% of its workforce, and three months after it closed a 5 million funding round that boosted the battery recycling company’s valuation to north of billion, as TechCrunch previously reported.
It’s been a difficult time in the battery industry lately. Earlier this month, battery recycler Ascend Elements filed for Chapter 11 bankruptcy protection, citing “insurmountable” financial challenges. Some battery-makers have also restructured or gone out of business as the automotive industry in the U.S. has backed away from its most optimistic and ambitious plans to transition to electric vehicles.
But Redwood Materials founder and CEO JB Straubel told employees that this new round of cuts is not a sign that the company is heading down the same path.
“Redwood today is the strongest it’s ever been,” Straubel wrote in an email to the workers who weren’t laid off, according to a copy viewed by TechCrunch. “The materials business is well on its way to profitability and has an exciting roadmap ahead.”
Straubel noted that Redwood “continue[s] to dominate the US battery recycling market” but also touted the company’s “great momentum” in its new energy storage business. Redwood has recently announced deals with Crusoe AI and, most recently, electric automaker Rivian to provide recycled batteries that can be used to power those companies’ facilities. The company declined to comment beyond the contents of Straubel’s email.
In his message, Straubel wrote that “parts of the company have expanded faster than needed to support the direction” of Redwood. As a result, he said Redwood is making cuts across multiple divisions, including the engineering and operations organizations, according to an employee who was granted anonymity to discuss the layoffs.
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San Francisco, CA
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“We are confident that we can deliver on our critical projects with a smaller team that is more focused,” he wrote. “We have successfully adapted to changes in the market that have bankrupted many of our competitors.”
Straubel went on to write that he is “more excited than ever with our path ahead as we build the most integrated and cost-effective critical materials and energy storage business in the world.”
“This is a self-sustaining business and will continue to make this company more valuable over time. We have the team and the technology to do what no other company can,” he wrote.
Workers who were laid off were told by Redwood’s chief HR officer that the layoffs were made “to sharpen our focus, our work and the size of our teams to support the direction Redwood is going in the future,” according to a copy of her email, which was viewed by TechCrunch.
Employees who were laid off are receiving severance and paid health benefits, according to Straubel’s email, as well as “career transition assistance.”
“I am grateful to the approximately 135 employees who we say goodbye to today — they’ve all contributed to building Redwood,” he wrote.
When you purchase through links in our articles, we may earn a small commission. This doesn’t affect our editorial independence.#Exclusive #Redwood #Materials #lays #restructuring #chase #energy #storage #business #TechCrunchBatteries,battery recycling,electric vehicles,EVs,Exclusive,Redwood Materials](https://i1.wp.com/techcrunch.com/wp-content/uploads/2023/09/53200897797_87d290a75e_o.jpg?resize=1200%2C800&ssl=1 "Exclusive: Redwood Materials lays off 10% in restructuring to chase energy storage business | TechCrunch
Redwood Materials has laid off around 135 employees, or roughly 10% of its workforce, as it restructures to better accommodate its growing energy storage business, TechCrunch has learned.
The cuts come just five months after Redwood cut 5% of its workforce, and three months after it closed a 5 million funding round that boosted the battery recycling company’s valuation to north of billion, as TechCrunch previously reported.
It’s been a difficult time in the battery industry lately. Earlier this month, battery recycler Ascend Elements filed for Chapter 11 bankruptcy protection, citing “insurmountable” financial challenges. Some battery-makers have also restructured or gone out of business as the automotive industry in the U.S. has backed away from its most optimistic and ambitious plans to transition to electric vehicles.
But Redwood Materials founder and CEO JB Straubel told employees that this new round of cuts is not a sign that the company is heading down the same path.
“Redwood today is the strongest it’s ever been,” Straubel wrote in an email to the workers who weren’t laid off, according to a copy viewed by TechCrunch. “The materials business is well on its way to profitability and has an exciting roadmap ahead.”
Straubel noted that Redwood “continue[s] to dominate the US battery recycling market” but also touted the company’s “great momentum” in its new energy storage business. Redwood has recently announced deals with Crusoe AI and, most recently, electric automaker Rivian to provide recycled batteries that can be used to power those companies’ facilities. The company declined to comment beyond the contents of Straubel’s email.
In his message, Straubel wrote that “parts of the company have expanded faster than needed to support the direction” of Redwood. As a result, he said Redwood is making cuts across multiple divisions, including the engineering and operations organizations, according to an employee who was granted anonymity to discuss the layoffs.
Techcrunch event
San Francisco, CA
|
October 13-15, 2026
“We are confident that we can deliver on our critical projects with a smaller team that is more focused,” he wrote. “We have successfully adapted to changes in the market that have bankrupted many of our competitors.”
Straubel went on to write that he is “more excited than ever with our path ahead as we build the most integrated and cost-effective critical materials and energy storage business in the world.”
“This is a self-sustaining business and will continue to make this company more valuable over time. We have the team and the technology to do what no other company can,” he wrote.
Workers who were laid off were told by Redwood’s chief HR officer that the layoffs were made “to sharpen our focus, our work and the size of our teams to support the direction Redwood is going in the future,” according to a copy of her email, which was viewed by TechCrunch.
Employees who were laid off are receiving severance and paid health benefits, according to Straubel’s email, as well as “career transition assistance.”
“I am grateful to the approximately 135 employees who we say goodbye to today — they’ve all contributed to building Redwood,” he wrote.
When you purchase through links in our articles, we may earn a small commission. This doesn’t affect our editorial independence.#Exclusive #Redwood #Materials #lays #restructuring #chase #energy #storage #business #TechCrunchBatteries,battery recycling,electric vehicles,EVs,Exclusive,Redwood Materials")
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