Turn Off the Lights: The Overlooked Sleep Habit That May Protect Your Heart

By Dustin Strong, CHN-ACN

What if one of the most overlooked cardiovascular risk factors isn’t in your kitchen…

…but glowing quietly beside your bed every night?

A growing body of research is pointing toward something surprisingly simple:

sleeping in a darker environment may significantly impact long-term heart and brain health.

A recent study presented at the American Heart Association Scientific Sessions 2025 found that people exposed to more artificial light at night had increased stress-related activity in the brain, greater arterial inflammation, and ultimately a higher risk of heart attack and stroke over time.

The findings are important.

But perhaps more importantly, they remind us of something we are increasingly forgetting in modern life:

The body responds to environment.

Healing is about variables.

And many of the variables affecting our health today are not dramatic or obvious.

They are subtle, chronic, and repeated thousands of times over years.

Including the light we sleep beside.

Modern Humans Are Sleeping in Unnatural Conditions

For most of human history, nights were dark.

The body synchronized itself to sunset, firelight, moonlight, and dawn. Hormones rose and fell according to rhythms that shaped sleep, metabolism, blood pressure, immune function, repair, and recovery.

Now many people sleep with:

• televisions glowing in the background

• bright digital alarm clocks

• phones flashing notifications

• hallway light leaking under doors -sneaky!

• LED chargers blinking

• streetlights shining through windows

Even modest light exposure may influence the nervous system more than people realize.

The brain interprets light as information.

And artificial light at night may quietly signal the body to remain alert rather than fully shift into restoration and repair.

Sleep Is Not “Downtime”

One of the greatest misconceptions in modern health is that sleep is passive.

Sleep is active recovery.

During deep sleep:

• blood pressure should naturally decline

• stress hormones recalibrate

• tissues repair

• inflammatory processes settle

• the brain performs waste clearance

• memory consolidates

• hormones rebalance

Darkness plays a major role in initiating these processes.

When the environment stays artificially bright, the body may struggle to fully enter restorative states.

This is where melatonin becomes especially important.

Melatonin Is About More Than Sleep

Most people think of melatonin simply as a “sleep hormone.”

But melatonin is far more interesting than that.

Melatonin also appears to play roles in:

• antioxidant protection

• mitochondrial function

• immune regulation

• cardiovascular health

• nervous system recovery

• brain detoxification during sleep

Darkness signals the body to produce melatonin naturally.

Without adequate darkness, the timing and amount of melatonin production may be disrupted.

This matters because the heart and brain are deeply interconnected.

The Heart and Brain Are One Conversation

Poor sleep affects far more than energy levels the next day.

Research continues to connect disrupted sleep with:

• elevated inflammation

• insulin resistance

• blood pressure dysregulation

• increased cardiovascular risk

• mood changes

• cognitive decline

The heart and brain are constantly communicating.

When sleep becomes fragmented, shallow, or biologically mistimed, both systems may suffer simultaneously.

This is one reason I continue encouraging people to think differently about longevity.

Longevity is not merely about extending years.

It is about protecting function.

Protecting clarity.

Protecting vitality.

Protecting resilience.

Protecting the ability to experience life fully.

And often, that begins with foundational habits that seem deceptively simple.

Small Changes Can Make a Big Difference

The encouraging part of this conversation is that improving your sleep environment does not require perfection.

Even reducing one source of nighttime light may help support a calmer nervous system and better sleep quality.

Simple strategies include:

• blackout curtains

• covering LED lights

• removing televisions from the bedroom

• placing phones face down or outside the room

• using motion-sensing nightlights instead of leaving lights on

• wearing a comfortable sleep mask if necessary

These are small shifts.

But small shifts repeated nightly become powerful biological signals over time.

The Bigger Picture

We spend enormous amounts of money searching for the next breakthrough in longevity while many people are sleeping inches away from glowing blue light every night.

Sometimes healing does not begin by adding more.

Sometimes healing begins by removing interference.

By honoring darkness.

By honoring stillness.

By allowing the body the environment it was designed to recover within.

The science is becoming increasingly clear:

Darker nights may help create healthier days.

And perhaps one more degree of health is waiting for many people… simply on the other side of turning off the lights.