Health
Knowing your sleep chronotype can lead to better rest and health
If you feel more sluggish during certain times of the day, it could be due to your sleep chronotype.
The chronotype affects the body’s natural tendency to be asleep or awake, according to the Sleep Foundation.
Knowing and adapting to the ideal schedule for your sleep chronotype could improve your rest and help you accomplish daily tasks more efficiently, sleep experts say.
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“Your chronotype, or natural sleep-wake preference, refers to your natural tendencies to feel awake or sleepy at different times of the day,” Dr. Anne Marie Morse, a pediatric sleep medicine physician in Pennsylvania, told Fox News Digital.
There are four main types of sleep chronotypes: Bear, Wolf, Lion and Dolphin.
There are four main types of sleep chronotypes: Bear, Wolf, Lion and Dolphin. (iStock)
Genetics, age, geography and the body’s circadian rhythm (its internal 24-hour clock) can determine one’s chronotype, the Sleep Foundation said in its report.
In addition to sleep quality, chronotypes can also influence appetite, exercise and body temperature.
Breaking down the chronotypes
Dr. Michael Breus, Ph.D., a board-certified sleep specialist in Los Angeles, first introduced the four chronotypes based on sleep-wake patterns seen in certain animals.
“We’ve discussed early birds and night owls, but I’ve broken it down further into four categories based on other animals,” he told Fox News Digital.
“Your chronotype, or natural sleep-wake preference, refers to your natural tendencies to feel awake or sleepy at different times of the day.”
“Each of these four chronotypes is defined by specific windows of productivity during which they function and perform at their best … at different times of day.”
Lion
Individuals who are considered the Lion chronotype typically wake up early (around 6 a.m.), are more productive in the morning hours and prefer to nap around 1:30 p.m., according to a report by Breus on his website.
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Their energy begins to wind down in the early evening and they may struggle with socializing at night, according to Breus’ report. Bedtime is usually around 10 p.m.
An estimated 15% of individuals fall into this chronotype.
Bear
The Bear chronotype wakes up with the sun at around 7 a.m., functions well during traditional office hours between 10 a.m. and 2 p.m., and does not struggle with attending evening social activities.
Wolf chronotypes are similar to “night owls.” As the day winds down, these individuals’ energy levels rev up. (iStock)
This chronotype prefers to go to bed at around 11 p.m., according to the Sleep Foundation report.
Bears account for around 55% of individuals.
Wolf
Wolf chronotypes are similar to “night owls.” As the day winds down, these individuals’ energy levels rev up with a preferred bedtime at around midnight, Breus stated in his report.
People in this category typically wake up around 7:30 a.m., are groggy in the morning and are most productive between the hours of 1 and 5 p.m., according to the Sleep Foundation.
About 15% percent of people are considered to be this chronotype.
Dolphin
Those in the Dolphin chronotype are usually light sleepers, have a hard time unwinding at bedtime, and rarely follow a consistent bedtime schedule, several sleep experts told Fox News Digital.
Dolphins wake up at around 6 a.m., are most productive between the hours of 3 p.m. and 7 p.m., and go to bed at around 11 p.m.
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“Those with the Dolphin chronotype have difficulty following any sleep schedule due to disturbances like noise and light,” Morse told Fox News Digital. “Productivity is best in the late mornings to early afternoons.”
People struggling with insomnia are often Dolphin chronotypes, according to Morse.
Nearly 10% of individuals fall into this category.
How to determine your chronotype
To determine your chronotype, the Sleep Foundation recommends considering your sleep preferences, your energy levels throughout the day and when you eat your meals.
Questionnaires such as the Morning-Eveningness Questionnaire (MEQ) and the Munich Chronotype Questionnaire (MCTQ) can help determine one’s chronotype.
Understanding how your chronotype works can help you sleep better at night and feel more refreshed during the day, experts say. (iStock)
Breus also developed an online chronotype quiz at SleepDoctor.com to help individuals determine whether they are a Bear, Wolf, Lion or Dolphin.
Understanding how your chronotype works can help you sleep better at night and feel more refreshed during the day, according to Breus.
Adjusting schedules based on chronotype
After pinpointing your chronotype, Breus recommends tailoring daily activities based on periods of peak energy and productivity levels.
“If you frequently experience poor sleep quality despite getting a full night’s sleep, you may be working against your chronotype,” he said.
Morse recommends that people schedule important tasks at times when they naturally feel most alert and to adjust bedtimes to fit their natural sleep patterns, rather than “powering through” schedules that don’t match their chronotypes.
After pinpointing your chronotype, experts recommend tailoring daily activities based on periods of peak energy and productivity levels. (iStock)
For example, an individual who is categorized as a Lion should try to tackle large projects, important meetings or social activities earlier in the morning, when their tendency is to be most energetic and productive, the expert said.
Since they are typically early risers, Morse said Lions should establish an early bedtime to ensure that they get enough sleep. She also advised Lions to avoid large meals or rigorous exercise in the late evening, which could delay sleep.
“If you are a naturally late riser, or a Wolf chronotype, forcing yourself to wake up too early may lead to sleep deprivation.”
“If you are a naturally late riser, or a Wolf chronotype, forcing yourself to wake up too early may lead to sleep deprivation and could negatively impact health,” Morse told Fox News Digital.
“Wolves are the most productive in the afternoon, so steer away from big morning plans for optimal performance.”
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Morse also suggested that Wolf chronotypes sleep in cool, dark and quiet bedrooms, using blackout curtains or a sleep mask to block out early-morning light.
Since Dolphin chronotypes do not usually follow a set sleep schedule, Morse recommends that they prioritize going to bed and waking up at the same time every day, even on weekends.
The American Academy of Sleep Medicine recommends getting at least seven hours of sleep per night to support overall health and well-being. (iStock)
“If you’re having difficulty falling asleep or staying asleep at night, try to avoid naps during the day and avoid screen time at least 30 minutes to an hour before bed,” he suggested.
For those who fall into the Bear chronotype, Morse suggests getting sunlight exposure immediately upon waking in the morning. In the event of an afternoon slump, he recommends opting for a short nap at around 2 p.m. instead of reaching for caffeine.
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If daily obligations get in the way of adhering to ideal bedtime schedules, Morse said the best step is to try to gain better alignment.
Regardless of chronotype, the American Academy of Sleep Medicine recommends getting at least seven hours of sleep per night to support overall health and well-being.
Health
ChatGPT could miss your serious medical emergency, new study suggests
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This story discusses suicide. If you or someone you know is having thoughts of suicide, please contact the Suicide & Crisis Lifeline at 988 or 1-800-273-TALK (8255).
Artificial intelligence has been touted as a boon to healthcare, but a new study has revealed its potential shortcomings when it comes to giving medical advice.
In January, OpenAI launched ChatGPT Health, the medical-focused version of the popular chatbot tool.
The company introduced the tool as “a dedicated experience that securely brings your health information and ChatGPT’s intelligence together, to help you feel more informed, prepared and confident navigating your health.”
But researchers at the Icahn School of Medicine at Mount Sinai have found that the tool failed to recommend emergency care for a “significant number” of serious medical cases.
The study, published in the journal Nature Medicine on Feb. 23, aimed to explore how ChatGPT Health — which is reported to have about 40 million users daily — handles situations where people are asking whether to seek emergency care.
Artificial intelligence has been touted as a boon to healthcare, but a new study has revealed its potential shortcomings when it comes to giving medical advice. (iStock)
“Right now, no independent body evaluates these products before they reach the public,” lead author Ashwin Ramaswamy, M.D., instructor of urology at the Icahn School of Medicine at Mount Sinai in New York City, told Fox News Digital.
“We wouldn’t accept that for a medication or a medical device, and we shouldn’t accept it for a product that tens of millions of people are using to make health decisions.”
Emergency scenarios
The team created 60 clinical scenarios across 21 medical specialties, ranging from minor conditions to true medical emergencies.
Three independent physicians then assigned an appropriate level of urgency for each case, based on published clinical practice guidelines in 56 medical societies.
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The researchers conducted 960 interactions with ChatGPT Health to see how the tool responded, taking into account gender, race, barriers to care and “social dynamics.”
While “clear-cut emergencies” — such as stroke or severe allergy — were generally handled well, the researchers found that the tool “under-triaged” many urgent medical issues.
The team created 60 clinical scenarios across 21 medical specialties, ranging from minor conditions to true medical emergencies. (iStock)
For example, in one asthma scenario, the system acknowledged that the patient was showing early signs of respiratory failure — but still recommended waiting instead of seeking emergency care.
“ChatGPT Health performs well in medium-severity cases, but fails at both ends of the spectrum — the cases where getting it right matters most,” Ramaswamy told Fox News Digital. “It under-triaged over half of genuine emergencies and over-triaged roughly two-thirds of mild cases that clinical guidelines say should be managed at home.”
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Under-triage can be life-threatening, the doctor noted, while over-triage can overwhelm emergency departments and delay care for those in real need.
Researchers also identified inconsistencies in suicide risk alerts. In some cases, it directed users to the 988 Suicide and Crisis Lifeline in lower-risk scenarios, and in others, it failed to offer that recommendation even when a person discussed suicidal ideations.
“ChatGPT Health performs well in medium-severity cases, but fails at both ends of the spectrum.”
“The suicide guardrail failure was the most alarming,” study co-author Girish N. Nadkarni, M.D., chief AI officer of the Mount Sinai Health System, told Fox News Digital.
ChatGPT Health is designed to show a crisis intervention banner when someone describes thoughts of self-harm, the researcher noted.
OpenAI launched ChatGPT Health, the medical-focused version of the popular chatbot tool, in January 2026. (Gabby Jones/Bloomberg via Getty Images)
“We tested it with a 27-year-old patient who said he’d been thinking about taking a lot of pills,” Nadkarni said. “When he described his symptoms alone, the banner appeared 100% of the time. Then we added normal lab results — same patient, same words, same severity — and the banner vanished.”
“A safety feature that works perfectly in one context and completely fails in a nearly identical context … is a fundamental safety problem.”
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The researchers were also surprised by the social influence aspect.
“When a family member in the scenario said ‘it’s nothing serious’ — which happens all the time in real life — the system became nearly 12 times more likely to downplay the patient’s symptoms,” Nadkarni said. “Everyone has a spouse or parent who tells them they’re overreacting. The AI shouldn’t be agreeing with them during a potential emergency.”
Fox News Digital reached out to Open AI, creator of ChatGPT, requesting comment.
Physicians react
Dr. Marc Siegel, Fox News senior medical analyst, called the new study “important.”
“It underlines the principle that while large language models can triage clear-cut emergencies, they have much more trouble with nuanced situations,” Siegel, who was not involved in the study, told Fox News Digital.
ChatGPT and other LLMs can be helpful tools, a doctor said, but they “should not be used to give medical direction.” (iStock)
“This is where doctors and clinical judgment come in — knowing the nuances of a patient’s history and how they report symptoms and their approach to health.”
ChatGPT and other LLMs can be helpful tools, Siegel said, but they “should not be used to give medical direction.”
“Machine learning and continued input of data can help, but will never compensate for the essential problem – human judgment is needed to decide whether something is a true emergency or not.”
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Dr. Harvey Castro, an emergency physician and AI expert in Texas, echoed the importance of the study, calling it “exactly the kind of independent safety evaluation we need.”
“Innovation moves fast. Oversight has to move just as fast,” Castro, who also did not work on the study, told Fox News Digital. “In healthcare, the most dangerous mistakes happen at the extremes, when something looks mild but is actually catastrophic. That’s where clinical judgment matters most, and where AI must be stress-tested.”
Study limitations
The researchers acknowledged some potential limitations in the study design.
“We used physician-written clinical scenarios rather than real patient conversations, and we tested at a single point in time — these systems update frequently, so performance may change,” Ramaswamy told Fox News Digital.
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Additionally, most of the missed emergencies happened in situations where the danger depended on how the condition was changing over time. It’s not clear whether the same problem would happen with acute medical emergencies.
Because the system had to choose just one fixed urgency category, the test may not reflect the more nuanced advice it might give in a back-and-forth conversation, the researchers noted.
ChatGPT Health is designed to show a crisis intervention banner when someone describes thoughts of self-harm. (iStock)
Also, the study wasn’t large enough to confidently detect small differences in how recommendations might vary by race or gender.
“We need continuous auditing, not one-time studies,” Castro noted. “These systems update frequently, so evaluation must be ongoing.”
‘Don’t wait’
The researchers emphasized the importance of seeking immediate care for serious issues.
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“If something feels seriously wrong — chest pain, difficulty breathing, a severe allergic reaction, thoughts of self-harm — go to the emergency department or call 988,” Ramaswamy advised. “Don’t wait for an AI to tell you it’s OK.”
The researchers noted that they support the use of AI to improve healthcare access, and that they didn’t conduct the study to “tear down the technology.”
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“These tools can be genuinely useful for the right things — understanding a diagnosis you’ve already received, looking up what your medications do and their side effects, or getting answers to questions that didn’t get fully addressed in a short doctor’s visit,” Ramaswamy said.
“That’s a very different use case from deciding whether you need emergency care. Treat them as a complement to your doctor, not a replacement.”
“This study doesn’t mean we abandon AI in healthcare.”
Castro agreed that the benefits of AI health tools should be weighed against the risks.
“AI health tools can increase access, reduce unnecessary visits and empower patients with information,” he said. “They are not inherently unsafe, but they are not yet substitutes for clinical judgment.”
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“This study doesn’t mean we abandon AI in healthcare,” he went on. “It means we mature it. Independent testing and stronger guardrails will determine whether AI becomes a safety net or a liability.”
Health
Diabetes surge among Americans could be driven by ‘healthy’ breakfasts, doctor warns
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Americans consume foods every day that are marketed as “healthy,” when they could be quietly destroying their health, one doctor warns.
Dr. Mark Hyman, physician and co-founder of Function Health in California, says that much of America’s daily diet is filled with unhealthy ingredients.
“The amount of refined starches and sugars that are everywhere is just staggering to me, given what we know about how harmful they are,” he shared in an interview with Fox News Digital. “I don’t think people really understand.”
Hyman, author of the new book “Food Fix Uncensored,” said he’s “astounded” by what people are eating, especially for breakfast.
“People just eat sugar for breakfast,” he said. “They have muffins, they have bagels, they have croissants, they have sugar-sweetened coffees and teas.”
Dr. Mark Hyman is the author of the new book “Food Fix Uncensored.” (Function Health; Little, Brown Spark)
In addition to the traditionally sweet options for breakfast, some cereal brands and breakfast staples have adopted new “protein-packed” menu items and products, following health trends that encourage eating more protein.
“Highly processed food is not food.”
“Now, we’re seeing this halo of protein in certain things,” Hyman said, mentioning that many protein smoothies are “full of sugar.”
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The doctor also noted that some popular cereals are now marketed as having protein in them. “My joke is, if it has a health claim on the label, it’s definitely bad for you,” he said.
Instead of starting the day with a “quick fix” or processed food, Hyman suggests choosing whole sources of protein and fat for breakfast, adding that “if there’s a little carbohydrate in there, it’s fine.”
More products marketed as “high protein” have cropped up on supermarket shelves. (iStock)
For his own breakfast, Hyman said he has a protein shake with whey protein, avocado and frozen berries. Eggs and avocados are also a great protein-and-fat combo option, he added.
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“It’s not that complicated — people need to just think about their breakfast not being dessert,” he said. “No wonder we’re in this cycle of obesity and diabetes. One in three teenage kids now has type 2 diabetes or pre-diabetes. That’s just criminal.”
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Instead of counting calories and being in a caloric deficit as a way to lose weight and stay healthy, Hyman instead suggests focusing on how certain foods make you feel and how they impact your health.
“When you look at the way in which different types of calories affect your biology, you can just choose what you’re eating, and then you don’t have to worry about how much,” he told Fox News Digital.
In addition to the traditionally sweet options for breakfast, some cereal brands and breakfast staples have adopted new “protein-packed” menu items and products. (iStock)
“For example, if you eat a diet that doesn’t cause your insulin to spike — which is low in starch and sugar, higher in protein and fat — you won’t develop those swings in blood sugar, you won’t develop the spikes in insulin, you won’t deposit hungry fat … You will break that cycle.”
People are more likely to “self-regulate when they eat real food” instead of processed foods, which “bypasses the normal mechanisms of satiety, fullness and brain chemistry,” according to Hyman.
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“Ultraprocessed food and junk food or highly processed food is not food,” he said. “It doesn’t support the health and well-being of an organism. It doesn’t do that. It does the opposite.”
Health
Scientists make startling discovery when examining prostate cancer tissue
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Small fragments of plastic were found in the tumors of most prostate cancer patients, according to a new study from NYU Langone Health.
In past studies, microplastics have been found in almost every human organ and in bodily fluids, but their impact on human health still isn’t fully understood.
The researchers analyzed tissue samples from 10 patients with prostate cancer who underwent surgery to remove the entire organ.
Using visuals of both benign samples and tumor samples, as well as specialized equipment, the scientists identified plastic particles in 90% of the tumor samples and 70% of benign tissue samples, according to the study press release.
In past studies, microplastics were found in almost every single human organ along with bodily fluids, even the placenta. (iStock)
The cancerous tissue contained on average more than double the amount of plastic as healthy prostate tissue samples, the study found. This equates to about 40 micrograms of plastic per gram of tissue compared to 16 micrograms.
Researchers avoided contaminating the samples with other plastics by substituting standard tools with those made of aluminum, cotton and other non-plastic material, the release noted.
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The scientists say this is the first direct evidence linking microplastics to prostate cancer.
“By uncovering yet another potential health concern posed by plastic, our findings highlight the need for stricter regulatory measures to limit the public’s exposure to these substances, which are everywhere in the environment,” said senior study author Vittorio Albergamo, assistant professor in the department of pediatrics at NYU Grossman School of Medicine, in the release.
Using visuals of both benign samples and tumor samples, as well as specialized equipment, the scientists identified plastic particles in 90% of the tumor samples and 70% of benign tissue samples. (iStock)
The study findings were presented during the American Society of Clinical Oncology’s Genitourinary Cancers Symposium in San Francisco on Feb. 26.
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“What is most striking is not that microplastics were detected, but that they were found embedded within tumor tissue itself,” Dr. David Sidransky, oncologist and medical advisor at SpotitEarly, a startup that offers an at-home breath-based test to detect early-stage cancer, told Fox News Digital.
“While complete avoidance is unrealistic, people can take practical steps to reduce exposure.”
“We already know microplastics are present in water, air, blood and even placental tissue. Their detection in prostate tumors suggests systemic distribution and long-term bioaccumulation,” added Maryland-based Sidransky, who was not involved in the study.
Study limitations
Albergamo cautioned that a larger sample is needed to confirm the findings. Additionally, Sidransky noted that the presence of microplastics alone does not prove they cause cancer.
“Tumors can act as ‘biologic sinks,’ meaning they may accumulate circulating particles simply because of altered vasculature and permeability,” he said.
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A key unanswered question, according to the doctor, is whether microplastics are biologically active in ways that “promote DNA damage, immune modulation or chronic inflammation within the prostate.”
About one in eight men in the U.S. will be diagnosed with prostate cancer at some point in their lifetime, according to the Centers for Disease Control and Prevention.
The most actionable step men can take is appropriate screening and early detection, according to doctors. (iStock)
For those concerned about microplastics, Sidransky offered some insights.
“I believe the appropriate response is curiosity, not panic, and a commitment to understand more,” he said.
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“While complete avoidance is unrealistic, people can take practical steps to reduce exposure, such as minimizing heating food in plastic containers, reducing bottled water consumption when possible, and favoring glass or stainless steel alternatives.”
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The most actionable step men can take, however, is getting appropriate screenings to help ensure early detection, according to the doctor. Screening discussions should be individualized based on age, family history and other risk factors.
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