What Is Blue Light? How Does It Impact Sleep?

Updated Dec 14, 2024 | 10:45 PM IST

SummaryScreens of electronic devices such as smartphones, computers, tablets, and televisions emit blue light. But does it impact your natural sleep cycle and circadian rhythm?
Blue Light

Blue Light (Credit: Canva)

Blue light emitted by devices like smartphones, computers, and televisions is becoming a major factor disrupting our sleep cycles. Research reveals that a significant number of Americans use electronic devices close to bedtime, contributing to poor sleep quality. Reducing exposure to blue light, particularly in the evening, is a simple yet effective way to help your body prepare for restful sleep.

What Is Blue Light?

Blue light is part of the visible light spectrum and is emitted by natural and artificial sources like the sun, fluorescent lights, LED lights, and digital screens. This wavelength is known for influencing our alertness, mood, and sleep patterns. During the day, blue light plays a role in regulating circadian rhythms, helping us stay alert and focused. However, exposure to it in the evening can have a detrimental effect on sleep quality.

How Does Blue Light Impact Circadian Rhythms?

Circadian rhythms are 24-hour cycles that control essential bodily functions, including sleep. Light is the primary factor that aligns these rhythms with day and night. Historically, exposure to sunlight during the day helped set our body clocks, signaling when to be awake and when to sleep. However, the widespread use of artificial lighting and electronic devices has introduced more light exposure after dark, disrupting these natural cycles.

Blue light, in particular, has the strongest impact on circadian rhythms. During daylight hours, blue light helps us feel alert by stimulating the brain, raising body temperature, and increasing heart rate. But in the evening, exposure to blue light can confuse the body’s internal clock, suppressing melatonin—the hormone responsible for making us feel sleepy. As a result, our brains may remain in “daytime mode,” preventing us from winding down for the night.

Health Consequences Of Disrupted Sleep

Persistent disruption of circadian rhythms can lead to a range of health issues, including metabolic disorders, poor mental health, and increased risk for conditions like depression and anxiety. Furthermore, the inability to sleep well at night affects cognitive performance, mood, and overall well-being. Chronic exposure to blue light in the evening may significantly contribute to these negative health outcomes.

Devices That Emit Blue Light

Many common devices in our daily lives emit blue light, including:

- Smartphones and tablets

- Computer monitors and laptops

- Televisions and e-readers

- LED and fluorescent lighting

- Video game consoles

How To Minimize Blue Light Exposure

To reduce the effects of blue light on your sleep, here are some practical strategies:

1. Turn off screens before bed: Try to avoid using electronic devices at least two to three hours before bedtime. Reducing screen time helps prevent blue light from interfering with melatonin production.

2. Adjust your lighting: Dim your home’s lights or switch to warmer-toned lighting in the evening. You can also use lamps with red or orange light, which are less likely to impact your circadian rhythms.

3. Night mode settings: Many smartphones and computers have a "night mode" feature that reduces blue light emission. Make use of these features to limit exposure in the hours leading up to bedtime.

4. Blue light-blocking glasses: Special glasses designed to filter out blue light may be helpful for some individuals. These glasses can block or reduce the melatonin-suppressing effects of blue light.

5. Apps for blue light reduction: There are several smartphone and computer apps available that reduce blue light emission, allowing you to use your devices before bed without disturbing your sleep.

6. Create a sleep-friendly environment: If you can’t control light sources in your bedroom, consider using an eye mask to block out ambient light and promote better sleep.

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The Cancer That Whispers And Why Ovarian Cancer Needs A Louder Voice

Updated May 8, 2026 | 07:00 AM IST

SummaryRoughly 250,000 women are diagnosed with ovarian cancer every year across the world. An estimated 140,000 will die from it. It is, by some measures, the deadliest of all gynecological cancers, and yet, it receives a fraction of the public attention given to breast cancer.
The Cancer That Whispers And Why Ovarian Cancer Needs A Louder Voice

Credit: AI generated image

There is a particular cruelty about ovarian cancer. It does not announce itself loudly. Instead, it murmurs softly with a bit of bloating here, some lower back pain there, a persistent sense that something is not quite right, but nothing dramatic enough to cause alarm. And by the time most women receive a diagnosis, the disease has often made itself very much at home.

Every year on May 8th, the world pauses to mark World Ovarian Cancer Day, an occasion that has grown since its launch in 2013 into a genuinely global movement. This year’s theme – ‘No Woman Left Behind’ – carries particular weight because the uncomfortable truth is that far too many women are being left behind by late diagnoses, by underfunded research, and by healthcare systems that have historically paid less attention to this disease than it deserves.

The Numbers We Need to Sit With

Roughly 250,000 women are diagnosed with ovarian cancer every year across the world. An estimated 140,000 will die from it. It is, by some measures, the deadliest of all gynecological cancers, and yet, it receives a fraction of the public attention given to breast cancer.

The comparison is worth dwelling on. Approximately 89 per cent of breast cancer patients survive beyond five years. For ovarian cancer, that figure drops to around 45 per cent – nearly half! And the primary reason for that stark difference is not that ovarian cancer is inherently untreatable but that it is rarely caught in its early stages.

When diagnosed at Stage I before the cancer has spread beyond the ovaries, survival rates climb dramatically, with some studies suggesting above 90 per cent. The problem is that only around 20 per cent of cases are caught that early. The rest are diagnosed at Stage III or Stage IV, when the cancer has already spread to the abdomen, lymph nodes, or beyond.

Why Does It Get Missed?

Ask most people to name the symptoms of ovarian cancer, and you will likely be met with a blank look. That in itself is part of the problem. Unlike the distinct lump in breast cancer cases or the irregular bleeding associated with cervical and uterine cancer, ovarian cancer does not produce one clear and recognizable sign. What it does produce are symptoms that most of us would simply dismiss – persistent bloating, feeling full quickly when eating, pelvic or lower abdominal pain, urge to urinate more frequently or urgently, unexplained fatigue, and a change in bowel habits.

Each of those individually could be attributed to several other conditions, including irritable bowel syndrome, gut infections, stress, dietary changes, and even getting older. That is precisely what makes this disease so dangerous. Women dismiss these symptoms. Sometimes doctors do too.

This is not about blame; it is about recognition. The medical community has made genuine progress in understanding ovarian cancer, but there simply aren’t any reliable early-screening tests available that are similar to mammograms for breast cancer or smear tests for cervical cancer. Hence, genuine and widespread public awareness becomes the closest thing to building a first line of defense.

No Woman Left Behind: A Global Reckoning

The 2026 theme is not merely a slogan. It is a confrontation with the reality that a woman’s place of residence, country, or economic circumstances should not determine whether or not she lives.

In higher-income countries, access to surgery and chemotherapy, whilst still imperfect, is broadly available. Newer treatments are beginning to extend survival times for women with advanced disease. Research into biomarkers is advancing, offering hope for earlier detection in the future.

But in lower-income countries, the picture is vastly different. Women are often diagnosed later, treated less effectively, and supported less comprehensively. The global survival gap for ovarian cancer is not simply a medical problem; it is more a problem of justice.

‘No Woman Left Behind’ asks us to hold that in mind. Progress that only reaches the privileged is not progress enough.

What Women Can Do Right Now

The absence of a reliable screening test makes personal awareness all the more essential. There are several things every woman can do, not just on May 8 but throughout the year.

  • Know your body – That phrase risks sounding hollow, but it carries real weight here. If you notice symptoms – particularly if they are new, persistent, and happening more than 12 times a month – do not dismiss them. Note them down and take them seriously.
  • Know your family history – Ovarian cancer has a significant genetic component. Mutations in the BRCA1 and BRCA2 genes substantially increase a woman’s lifetime risk. If you have a family history of ovarian or breast cancer, speak to your GP about whether genetic testing might be appropriate for you. Knowledge is not a cause for panic; it is a basis for informed decisions.
  • Advocate for yourself – This is perhaps the hardest one to say and the most important. Women have historically been more likely to have their symptoms dismissed or attributed to anxiety, hormones, or stress. If something does not feel right, go back and ask again. Push for a referral. You are entitled to be taken seriously.
  • Talk about it – The single most powerful thing any of us can do is have conversations — with friends, with family members, in offices, and community spaces. The more ovarian cancer is spoken about, the more women will recognize its symptoms. And the more symptoms are recognized early, the more lives can be saved.

The Quiet Power of Collective Action

Since 2013, World Ovarian Cancer Day has grown into a movement that now spans more than 80 per cent of the world’s countries and is supported by over 200 organizations globally. That is an extraordinary thing. It is proof that sustained, collective attention can shift awareness, influence policy, and ultimately change outcomes.

But awareness days only work if they spark something beyond the day itself. The teal ribbons and social media posts matter, not because they are gestures, but because every gesture has the potential to reach someone who needs to hear it, someone whose bloating has been going on for two months, someone whose mother was diagnosed with breast cancer and who has never thought to ask whether their own risk might be elevated. Someone who simply did not know.

Therefore, let us spread awareness this day by realizing that equality is not in regarding different things similarly, equality is in regarding different things differently, and still leaving no one behind.

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Bloating vs Ovarian Cancer: Gynaecologist Shares Tips To Tell The Difference

Updated May 8, 2026 | 12:00 AM IST

SummaryBloating is one of the symptoms of ovarian cancer. But can you tell the difference when it is just a swollen belly?
persistent bloating

Frequent bloating is a cause of concern. (Photo credit: AI generated)

Many women do not consider persistent bloating to be a serious issue because they tend to correlate their symptoms with acidity, excessive gas, overeating, or other temporary issues caused by their digestive system. Many women tend to treat their symptoms on their own by changing their diet or taking over-the-counter medications without looking into what the underlying problem may be. Many women do this because their symptoms initially seem mild. However, it is important to pay attention to any persistent bloating, especially if the bloating occurs on a regular basis, has lasted for at least one month, or is associated with symptoms such as pelvic discomfort, loss of appetite, an increased feeling of fullness, or irregular bowel habits (diarrhoea, constipation, etc.).

Is persistent bloating a sign of ovarian cancer?

In an interaction with Health and Me, Dr Parnamita Bhattacharya, Gynaecologist at CK Birla Hospitals, CMRI, spoke about the concerns surrounding persistent bloating and whether it is associated with the risk of ovarian cancer.

One of the most significant concerns surrounding persistent bloating is that women can develop ovarian cancer, especially in the early stages, without knowing or having any obvious signs that they have the disease. Because there are no routine screening tests to detect ovarian cancer in the general population, it is critical for women to be on the lookout for any symptoms of persistent bloating and report them immediately to their doctor. Unfortunately, because women often ignore their symptoms and fail to seek medical attention, by the time they do see a doctor, ovarian cancer has progressed to a later stage of development.

How to know if it is digestion-related bloating?

Not all bloating is related to ovarian cancer. Other common contributing factors to bloating include irritable bowel syndrome, food intolerance, hormonal changes, and lifestyle factors. The significant difference between "normal" bloating and "abnormal" bloating is how long each type of bloating lasts and how quickly the symptoms progress. If your bloating continues despite dietary changes, or if it increases in frequency, you should not ignore the symptoms. You should have them evaluated by a medical professional.

It is important for women to understand the signals sent by their bodies. If you frequently experience bloating, this issue needs to be investigated and not just accepted as normal. If you seek timely evaluation, doctors can determine the source of your problem early on, which greatly increases your chances of a good outcome from a serious diagnosis such as ovarian cancer.

What are the symptoms of ovarian cancer?

Ovarian cancer symptoms can be vague and may develop as the disease progresses. Therefore, timely detection is a challenge. Some of the signs of ovarian cancer include:

  1. Pain in the pelvic region
  2. Swollen belly
  3. Loss of appetite
  4. Feeling full after small meals
  5. Nausea
  6. Diarrhoea
  7. Constipation
  8. Unexpected weight loss
  9. Painful sex
  10. Extreme fatigue
  11. Abnormal vaginal bleeding between periods

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Former New York Mayor Rudy Giuliani Out Of ICU; To Remain Hospitalized

Updated May 7, 2026 | 06:00 PM IST

SummaryRudy Giuliani is a longtime ally of President Donald Trump. In 2025, Trump also announced awarding Giuliani with the Presidential Medal of Freedom, the country's highest civilian honor.
Former New York Mayor Rudy Giuliani Out Of ICU; To Remain Hospitalized

Credit: AP

Former New York City Mayor Rudy Giuliani has been discharged from the ICU but will remain in the hospital for “some time” as he recovers from pneumonia, according to his spokesperson.

In a post on social media platform X, spokesperson Ted Goodman said Giuliani, 81, was hospitalized earlier this week in critical but stable condition.

Giuliani, who served as New York City's mayor from 1994 to 2001, was previously diagnosed with restrictive airway disease following the infamous 9/11 terrorist incident, where he “took down the mafia, saved New York City, and ran toward the towers on September 11th".

However, the incident left Giuliani with lasting health complications, Goodman said, adding that the former NYC Mayor "is recovering from pneumonia”.

“The virus quickly overwhelmed his body, requiring mechanical ventilation to maintain adequate oxygen and stabilize his condition,” Goodman said.

Calling him the "same fighter he's always been, and he's winning this fight,” Goodman said that the "mayor and his family appreciate the outpouring of love and prayers sent his way”.

Notably, Giuliani is a longtime ally of President Donald Trump. In 2025, Trump also announced awarding Giuliani with the Presidential Medal of Freedom, the country's highest civilian honor.

What Is Pneumonia?

Pneumonia is an inflammatory condition of the lung tissue, most often caused by infections. It can affect one or both lungs and can range from mild to life-threatening, especially in vulnerable populations like the elderly, young children, or those with underlying health conditions.

There are several types of pneumonia, classified based on their causes—bacterial, viral, and fungal—and each has distinct patterns of transmission and severity.

What Causes Pneumonia?

Pneumonia is not a single disease but a syndrome resulting from various infectious agents:

Bacterial Pneumonia: This is the most common type, often developing as a secondary infection after a cold or flu. Streptococcus pneumoniae is the most frequent culprit.

Viral Pneumonia: Caused by viruses like influenza, respiratory syncytial virus (RSV), and SARS-CoV-2 (COVID-19), this type often starts in the upper respiratory tract and spreads to the lungs.

Fungal Pneumonia: This type is less common and usually affects individuals with weakened immune systems. It's typically contracted through environmental exposure, such as to soil or bird droppings.

Early Warning Signs You Shouldn’t Ignore

Pneumonia can be insidious. It often begins with symptoms that mimic the flu: headache, fatigue, and fever. But as the infection progresses, signs become more serious:

  • Persistent cough with green, yellow, or even bloody mucus
  • Shortness of breath
  • Chest pain, especially when breathing or coughing
  • High fever, chills, and night sweats
  • Confusion, especially in the elderly
  • Nausea or loss of appetite
The severity of symptoms often depends on the individual's age, overall health, and the type of pneumonia contracted.

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