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?

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.

It was during the COVID-19 pandemic that Annabelle Gurwitch, an American author, actress, and television host, developed a "a little persistent cough".

Suspecting it to be a COVID symptom, Annabelle went for a check-up. Her doctor alarmingly informed her about something suspicious on her lungs. Soon after, an X-ray and a biopsy confirmed her diagnosis of stage 4 cancer.

But, here's the catch. Annabelle is a non-smoker. She also lived a healthy lifestyle and exercised every day, and felt like she was in really good health, besides the persistent little cough.

Also read:American Author Annabelle Gurwitch Writes New Memoir On Stage-4 Lung Cancer Diagnosis

HealthandMe spoke to health experts to understand how a persistent cough signals the risk of lung cancer.

If you, too, are a non-smoker who is leading a healthy lifestyle and has no medical conditions other than a persistent cough, then you must visit your doctor right away, advised the experts.

"A persistent cough can be an early warning sign of lung cancer, especially when it shows specific features rather than behaving like a routine respiratory illness," Dr Sameer Khatri, Principal Director - Medical Oncology, Max Super Speciality Hospital, Patparganj, told HealthandMe.

The doctor noted that the cough becomes suspicious when it persists beyond three weeks without a clear cause or fails to respond to standard symptomatic treatment such as cough syrups, bronchodilators, etc.

"A change in a pre-existing smoker’s cough—for example, becoming more frequent, severe, or different in character—is particularly important. In non-smokers, a new, unexplained chronic cough should not be ignored," Dr. Khatri said.

Certain associated symptoms further strengthen the suspicion of cancer. The most significant is hemoptysis, the coughing up of blood or blood-stained mucus, even if minimal.

Other red flags include

• unintentional weight loss,
• chest pain,
• breathlessness,
• hoarseness,
• recurrent pneumonia in the same lung region.
• age >40 years,
• smoking history, occupational exposures.

Persistent cough: TB Vs Lung Cancer

Persistent cough also signals the risk of tuberculosis (TB) -- the world's most deadliest infectious disease. Understanding the differences between these two causes is critical for early diagnosis and timely treatment.

Dr Seema Jagiasi from MOC Cancer Care Center told HealthandMe that the cough in TB may sometimes produce blood-tinged phlegm, but it is usually associated with signs of infection, such as fatigue and a general feeling of illness.

TB is more common in younger populations and in individuals with weakened immunity or poor living conditions.

"In contrast, a cough associated with lung cancer tends to be more insidious. It may start as a dry, persistent cough that gradually worsens over time. Unlike TB, it may not initially present with fever or infection-related symptoms," the doctor explained.

Also read: Suffering From Mid-back Pain? Doctors Say It May Be Spinal TB

One of the key differences lies in progression and response to treatment.

TB is treatable with a course of antibiotics, and symptoms often improve within weeks of starting therapy. However, a lung cancer-related cough persists or worsens despite routine medications.

Dr Jagiasi emphasized that any cough lasting beyond three weeks, especially when accompanied by alarming symptoms, should not be ignored.

"Early investigations, such as chest imaging and further diagnostic tests, can help distinguish between the two conditions," the doctor said.

While both TB and lung cancer may present with a persistent cough, their underlying causes, associated symptoms, and progression differ significantly.

The health experts called for more awareness and the need for timely medical evaluation for the effective management of the disease.

Irish Actor Michael Patrick, known for his significant role in Game of Thrones, has sadly passed away at the young age of 35.

Sharing the news in a post on social media platform Instagram, his wife Naomi Sheehan shared that Michael Patrick (whom she fondly calls Mick) died after a years-long battle with Motor Neurone Disease.

"Last night, Mick sadly passed away in the Northern Ireland Hospice. He was diagnosed with Motor Neurone Disease on 1st February 2023. He was admitted 10 days ago and was cared for by the incredible team there. He passed peacefully, surrounded by family and friends," Naomi said.

Calling Michael a "titan of a ginger-haired man", she said that “Words can’t describe how broken-hearted we are".

Naomi called Michael an "inspiration to everyone."

Also read: Dismissed as Anxiety: Terry Crew’s Wife Rebecca Shares Decade-Long Struggle With Parkinson’s

What Is Motor Neurone Disease (MND)

MND is a rare and progressive neurodegenerative disease. According to NHS UK, it causes muscle weakness that gets worse over a few months or years. It's usually life-shortening, and there's currently no cure, but treatment can help manage the symptoms.

Symptoms of MND include:

• stiff or weak hands
• weak legs and feet
• twitches, spasms, or muscle cramps (where muscles painfully tighten).

It makes everyday tasks such as climbing stairs or gripping objects difficult.

Also read: Grey’s Anatomy Star Eric Dane Dies After ALS Battle

As the disease advances, patients may develop difficulties with breathing, swallowing, and speech, along with changes in mood or personality. In later stages, walking and movement can become extremely limited.

Treatment of MND

About 1,500 people are diagnosed with MND each year, yet treatment choices remain scarce. Only a small proportion of patients currently qualify for therapies that target the disease process itself.

MND can be difficult to diagnose in the early stages. But as the symptoms get worse, it can usually be confirmed.

Tests used to help diagnose MND include:

• blood tests
• tests to check how well your nerves are working
• an MRI scan to help rule out other conditions that affect the brain and nerves

1. Amyotrophic lateral sclerosis (ALS): Early symptoms include muscle weakness in the arms and legs can cause you to trip and drop things.

2. Progressive bulbar palsy (PBP): It mainly affects muscles in the face, throat, and tongue, causing slurred speech and problems swallowing.

3. Progressive muscular atrophy (PMA): It causes weakness in the hands.

4. Primary lateral sclerosis (PLS): Leads to weak legs, sometimes with other symptoms, including speech problems.

Common treatment options for MND include:

• physiotherapy and exercises to help with muscle weakness and stiffness
• dietary advice to help you maintain weight
• speech and language therapist to help with talking
• Cognitive behavioral therapy (CBT) to help cope with emotions and feelings, such as anxiety and depression.

During the COVID-19 pandemic, the SARS-CoV-2 virus had a significant impact on the eyes, causing conjunctivitis (pink eye), with red, itchy, watery, or painful eyes.

A new study now shows that eye symptoms may also be key in understanding the severity of long COVID, a collection of symptoms that last three months or longer after your first COVID symptoms.

The new study, published in the journal Clinical Ophthalmology, showed that the new onset of eye symptoms in people with long COVID may be an indicator of more severe disease.

Also read: Long Covid Causes Lasting Brain Inflammation And Lung Injury, Reveals Study

Key Findings

Researchers from the Yale School of Medicine analyzed survey data from 595 adults who self-reported having long COVID in surveys conducted from May 2022 to October 2023. They found that nearly 60 percent of people reported new-onset of ocular symptoms.

The findings suggest that ocular symptoms in long COVID may be interpreted as vision-related manifestations that cluster with systemic post-COVID conditions. The symptoms include a new onset of :

• blurred or lost vision,
• dry eyes,
• floaters or flashes

Notably, individuals with ocular symptoms reported:

• A greater overall symptom burden,
• Financial difficulties,
• Challenges in everyday life.

Also read: Long COVID: The Story Of Those Who Are Still Dealing With Symptoms And Illnesses

What is Long COVID

Long COVID includes a wide range of symptoms or conditions that may improve, worsen, or be ongoing. While anyone who gets COVID-19 can develop Long COVID, studies have shown that some groups of people are more likely to develop Long COVID than others, including:

• Women
• People who have experienced more severe COVID-19 illness, especially those who were hospitalized or needed intensive care
• People with underlying health conditions
• People who did not get a COVID-19 vaccine

While many of the Long COVID conditions remain to be fully recognized, some people have more than one symptom that can be moderate to severe, and also impact the quality of life. According to the US CDC, they include:

• Tiredness or fatigue
• Difficulty thinking or concentrating (sometimes called “brain fog”)
• Shortness of breath or difficulty breathing
• Headache
• Dizziness on standing
• Fast-beating or pounding heart (known as heart palpitations)
• Chest pain
• Cough
• Joint or muscle pain
• Depression or anxiety
• Fever
• Loss of taste or smell