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Sleep could help erase bad memories, study finds: ‘Therapy for our emotions’

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Sleep could help erase bad memories, study finds: ‘Therapy for our emotions’

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Sleep has been shown to have a long list of physical and mental health benefits, and now a new study suggests it could also help to “erase” bad memories.

That’s according to researchers from the University of Hong Kong, who implemented a procedure called “targeted memory reactivation” (TMR) to reactivate positive memories and weaken painful ones during sleep. 

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“Recollecting painful or traumatic experiences can be deeply troubling,” the researchers wrote in the findings, which were published in the journal PNAS. “Sleep may offer an opportunity to reduce such suffering.”

DEEP SLEEP CAN KEEP TWO BIG HEALTH PROBLEMS AT BAY, NEW STUDIES SUGGEST

“We developed a procedure to weaken older aversive memories by reactivating newer positive memories during sleep.”

A new study suggests that sleep could help to “erase” bad memories. (iStock)

In the study, a total of 37 participants were shown 48 “nonsense words,” each paired with a different unpleasant image, before going to sleep for the night.

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The next evening, they were shown half of the words paired with positive images from four categories: animals, babies, people and scenes. 

ANOTHER REASON TO GET MORE SLEEP AND THIS ONE MIGHT SURPRISE YOU

During the following “non-rapid-eye-movement” sleep, the researchers introduced “auditory memory cues.” 

When the participants woke, they had less memory of the negative images and stronger memory of the positive ones.

“Recollecting painful or traumatic experiences can be deeply troubling,” the researchers wrote. “Sleep may offer an opportunity to reduce such suffering.” (iStock)

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“Our results were aligned with recent TMR research showing that episodic forgetting could be induced via reactivating interfering memories during sleep,” the researchers wrote in the study.

“Going beyond prior research on neutral memories, our results suggest that TMR preferentially reactivated recently acquired positive memories and weakened older aversive memories, thus altering the fate of emotional experiences.” 

‘I CAN’T SLEEP BECAUSE OF RACING THOUGHTS AT NIGHT — HOW CAN I STOP THEM?’: ASK A DOCTOR

Dr. Earnest Lee Murray, a board-certified neurologist at Jackson-Madison County General Hospital in Jackson, Tennessee, noted that TMR has been a method for treating PTSD and other aversive (bad) memories.  

“This is done by combining sensory cues with therapeutic interventions and then re-presenting these cues during specific sleep phases,” Murray, who was not involved in the study, told Fox News Digital. 

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Many patients have reported improvements in mood and anxiety when sleep was improved, a sleep doctor said. (iStock)

This treatment has been shown to reduce the emotional impact of aversive memories, the neurologist added.

“This study not only shows a suppression or a weakening of aversive memory, but does so by reactivating newer positive memories while the patient is asleep,” Murray said. “This will open the door for additional research in ways to weaken traumatic or other bad memories.”

DO WOMEN NEED MORE SLEEP THAN MEN? HERE’S WHAT EXPERTS THINK

In addition to psychotherapies, medications are sometimes used to suppress nightmares or other aversive memories, he noted. 

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“This study continues to show ways to treat these conditions without the use of medications, which oftentimes are fraught with adverse side effects.”

“This study continues to show ways to treat these conditions without the use of medications, which oftentimes are fraught with adverse side effects,” a sleep doctor said. (iStock)

Alex Dimitriu, MD, a board-certified psychiatrist and sleep medicine doctor and founder of Menlo Park Psychiatry & Sleep Medicine in California, was also not involved in the study, but said it is “fascinating” in what it reveals about how the brain processes memories during sleep.

“Our brains are unpacking, processing and repacking emotions in our sleep,” he told Fox News Digital. “I had suspected this before, and have often told my patients that sleep is like therapy for our emotions.”

      

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Many of the doctor’s patients have reported improvements in mood and anxiety when sleep was improved.

“There has been evidence that in REM (dream sleep) in particular, a lot of emotional processing and rehearsal occurs,” Dimitriu said. “In this study, however, the intervention was in non-REM sleep, which shows that emotions are processed in other sleep phases as well.”

The process of using TMR to suppress negative emotions and fortify positive memories could have a “tremendous impact” on people with depression or trauma, an expert said. (iStock)

The process of using TMR to suppress negative emotions and fortify positive memories could have a “tremendous impact” on people with depression or trauma, the expert said.

“I am excited to see further research into this area, which essentially means we can learn and change while we are asleep.”

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Potential limitations

The study did have some limitations, the researchers noted.

“Our brains are unpacking, processing and repacking emotions in our sleep.”

“First, although our experiment aims to weaken aversive memories, the lab-induced emotional experiences of viewing aversive/positive images may not mimic typical traumatic experiences,” they wrote. 

It can also be difficult to find positive components within some highly traumatic experiences, they noted. 

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“Future research should explore ways to introduce positive interfering memories, such as positive autobiographical memories or therapy-related memories, to effectively weaken real-life trauma memories,” the researchers stated. 

“The role of REM sleep in modulating emotional memories shall be further investigated,” the study authors wrote. (iStock)

“Second, the role of REM sleep in modulating emotional memories shall be further investigated.”

The study received ethical approval from the Human Research Ethics Committee of the University of Hong Kong.

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Funders included the Ministry of Science and Technology of China and the National Natural Science Foundation of China, along with other grants.

Fox News Digital reached out to the researchers for comment.

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Experts Call It 2026’s Best Diet— ‘The Results Are Often Stunning’

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Experts Call It 2026’s Best Diet— ‘The Results Are Often Stunning’


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Deadly ‘superbug’ is spreading across US as drug resistance grows, researchers warn

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Deadly ‘superbug’ is spreading across US as drug resistance grows, researchers warn

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A deadly, drug-resistant fungus already spreading rapidly through U.S. hospitals is becoming even more threatening worldwide, though there may be hope for new treatments, according to a new scientific review.

Candida auris (C. auris), often described as a “superbug fungus,” is spreading globally and increasingly resisting human immune systems, Hackensack Meridian Center for Discovery and Innovation (CDI) researchers said in a review published in early December.

The findings reinforce prior CDC warnings that have labeled C. auris an “urgent antimicrobial threat” — the first fungal pathogen to receive that designation — as U.S. cases have surged, particularly in hospitals and long-term care centers.

DANGEROUS SPIKE IN SUPERBUG INFECTIONS SURGES ACROSS US AS EXPERTS SHARE CAUTIONS

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Approximately 7,000 cases were identified across dozens of U.S. states in 2025, according to the CDC, and it has reportedly been identified in at least 60 countries.

Candida auris is a drug-resistant fungus spreading in hospitals worldwide. (Nicolas Armer/Picture Alliance via Getty Images)

The review, published in Microbiology and Molecular Biology Reviews, helps explain why the pathogen is so difficult to contain and warns that outdated diagnostics and limited treatments lag behind. It was conducted by Dr. Neeraj Chauhan of the Hackensack Meridian CDI in New Jersey, Dr. Anuradha Chowdhary of the University of Delhi’s Medical Mycology Unit and Dr. Michail Lionakis, chief of the clinical mycology program at the National Institutes of Health.

Their findings stress the need to develop “novel antifungal agents with broad-spectrum activity against human fungal pathogens, to improve diagnostic tests and to develop immune- and vaccine-based adjunct modalities for the treatment of high-risk patients,” the researchers said in a statement.

GROWING ANTIBIOTIC CRISIS COULD TURN BACTERIAL INFECTIONS DEADLY, EXPERTS WARN

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“In addition, future efforts should focus on raising awareness about fungal disease through developing better surveillance mechanisms, especially in resource-poor countries,” they added. “All these developments should help improve the outcomes and prognosis of patients afflicted by opportunistic fungal infections.”

Candida auris can survive on skin and hospital surfaces, allowing it to spread easily. (iStock)

First identified in 2009 from a patient’s ear sample in Japan, C. auris has since spread to dozens of countries, including the U.S., where outbreaks have forced some hospital intensive care units to shut down, according to the researchers.

The fungus poses the greatest risk to people who are already critically ill, particularly those on ventilators or with weakened immune systems. Once infected, about half of patients may die, according to some estimates.

FLU BY STATE: WHERE THIS SEASON’S HIGHLY CONTAGIOUS VARIANT IS SPREADING THE MOST

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Unlike many other fungi, C. auris can survive on human skin and cling to hospital surfaces and medical equipment, allowing it to spread easily in healthcare settings.

“It is resistant to multiple antifungal drugs, and it tends to spread in hospital settings, including on equipment being used on immunocompromised and semi-immunocompromised patients, such as ventilators and catheters,” Dr. Marc Siegel, Fox News senior medical analyst and clinical professor of medicine at NYU Langone, previously told Fox News Digital.

Scientists say the unique cell wall structure of C. auris makes it harder to kill. (iStock)

It is also frequently misdiagnosed, delaying treatment and infection control measures.

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“Unfortunately, symptoms such as fever, chills and aches may be ubiquitous, and it can be mistaken for other infections,” Siegel said.

In September, he said intense research was ongoing to develop new treatments.

Only four major classes of antifungal drugs are currently available, and C. auris has already shown resistance to many of them. While three new antifungal drugs have been approved or are in late-stage trials, researchers warn that drug development has struggled to keep pace with the fungus’s evolution.

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Despite the sobering findings, there is still room for cautious optimism.

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The fungus can cling to skin and hospital surfaces, aiding its spread. (iStock)

In separate research published in December, scientists at the University of Exeter in England discovered a potential weakness in C. auris while studying the fungus in a living-host model. 

The team found that, during infection, the fungus activates specific genes to scavenge iron, a nutrient it needs to survive, according to their paper, published in the Nature portfolio journal Communications Biology in December.

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Because iron is essential for the pathogen, researchers believe drugs that block this process could eventually stop infections or even allow existing medications to be repurposed.

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“We think our research may have revealed an Achilles’ heel in this lethal pathogen during active infection,” Dr. Hugh Gifford, a clinical lecturer at the University of Exeter and co-author of the study, said in a statement.

New research is underway to develop better treatments and diagnostics for C. auris. (iStock)

As researchers race to better understand the fungus, officials warn that strict infection control, rapid detection and continued investment in new treatments remain critical.

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Health experts emphasize that C. auris is not a threat to healthy people.

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Fox News Digital has reached out to the CDI researchers and additional experts for comment.

Fox News Digital’s Angelica Stabile contributed reporting.

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Record-breaking flu numbers reported in New York state, sparking warnings from officials

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Record-breaking flu numbers reported in New York state, sparking warnings from officials

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The New York State Department of Health reported a record surge in influenza activity, with 71,123 positive flu cases recorded statewide during the week ending December 20.

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Health officials said the figure represents the highest number of flu cases ever reported in a single week since influenza became a reportable disease in New York in 2004.

State health data show the weekly total reflects a 38% increase from the previous reporting period, signaling a rapidly intensifying flu season.

There have been 189,312 reported positive flu cases so far this season, while influenza-related hospitalizations rose 63% in the most recent week.

FLU BY STATE: WHERE THIS SEASON’S HIGHLY CONTAGIOUS VARIANT IS SPREADING THE MOST

New York reported the highest weekly total of cases ever recorded since influenza became reportable in 2004. (iStock)

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“We are seeing the highest number of flu cases ever recorded in a single week in New York state,” Health Commissioner Dr. James McDonald said in a press release.

There have been 189,312 reported flu cases so far this season, with influenza-related hospitalizations increasing 63% in the most recent week. (iStock)

Earlier this month, the department declared influenza prevalent statewide, a designation that requires unvaccinated health care workers to wear masks in patient care settings.

SURGE IN WHOOPING COUGH CASES IN SOUTHERN STATE PROMPTS HEALTH ALERTS

Health officials continue to emphasize that vaccination remains the most effective way to prevent severe illness and hospitalization from influenza.

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New Yorkers who have not yet received a seasonal flu shot are still encouraged to do so, with experts saying vaccination can offer protection even later in the season.

Health officials continue to urge New Yorkers to take preventive steps, including vaccination and staying home when sick, to limit further spread. (iStock)

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To help limit further spread, the department advises individuals experiencing flu-like symptoms — including fever, cough, sore throat, or body aches — to stay home. State health officials also recommend frequent handwashing, using hand sanitizer, and avoiding close contact with sick individuals.

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For those who become ill, officials say antiviral medications are available and are most effective when started within 48 hours of symptom onset.

Health officials also added that people at higher risk for complications should contact a health care provider promptly for evaluation and possible treatment.

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The department noted that flu activity typically peaks in January, meaning case counts could continue to climb in the weeks ahead.

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