Light has an influence on sleep in more ways than you might think. It also has a crucial part in controlling our body’s sleep-wake cycle, which we call the circadian rhythm. Sunlight helps sync our internal clock making us feel awake during the day and tired at night. But artificial lights and screens in our modern world are messing with this natural process—often causing big problems for how well we sleep and our overall health.
The Role of Light in Sleep Regulation
Light tells the brain when it’s time to wake up or go to sleep. When light hits our eyes special cells send signals to the brain’s circadian pacemaker. This stops the production of melatonin—a hormone that makes us sleepy—and makes us feel more alert.
When night falls, your body ramps up melatonin production to get you ready for bed. But if you mess with this process especially by using artificial lights, you’ll confuse your brain and have trouble falling asleep.
Blue Light: The Worst Offender
Blue light from LEDs and screens (think phones, tablets, TVs, and computers) packs the biggest punch in stopping melatonin. If you’re exposed to blue light at night, it throws off your body clock, cuts down on your total sleep, and makes your sleep worse overall. Even a faint light (as low as eight lux) can mess with your melatonin levels.
Research shows that blue light has a stronger effect on melatonin suppression than green light of the same brightness. Blue light suppresses melatonin for twice as long and shifts the body’s internal clock by three hours. Green light shifts it by 1.5 hours. This makes using screens before bedtime bad for sleep.
Sleep Disorders and Circadian Misalignment
When people get exposed to light at odd times, it can cause problems with their body clocks:
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Shift Work Disorder: Many night shift workers face this condition. It messes up normal sleep because of unusual light exposure patterns. This leads to tiredness, trouble sleeping, and higher health dangers.
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Jet Lag: Quick travel across time zones causes short-term body clock mix-ups. This results in bad sleep and less alertness.
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Non-24-Hour Sleep-Wake Disorder: blind people have this condition. It involves a sleep-wake cycle that keeps changing because they can’t see light.
Health Impacts of Poor Light Hygiene
Regular exposure to blue light at night has links to higher risks of:
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Metabolic problems
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Heart disease
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Being overweight
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Feeling down
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Some types of cancer
Not getting enough light or getting it at the wrong time messes up sleep patterns, cuts down on deep sleep, and makes you wake up more during the night.
Handy Ways to Use Red Light to Improve Your Sleep
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Get the Most Out of Daylight: Sunlight in the morning helps set your body clock. Try to go outside or sit near windows.
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Cut Down on Blue Light at Night:
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Don’t use screens 1–2 hours before you sleep.
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Turn on night mode or blue light filters on your devices.
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Think about wearing blue-blocking glasses if you can’t avoid screens.
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Make Your Bedroom Dark:
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Hang blackout curtains and turn off lights you don’t need.
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If you need a night light, use a dim red one. It won’t mess with your melatonin much.
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Don’t sleep with the TV on. If you must, set a sleep timer.
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Change How You Use Lights:
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Put in cozy dim lights for nighttime use.
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Set up low-level lights that turn on when you move for trips to the bathroom at night.
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Sleep with an eye mask if you can’t make the room dark.
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Think About Using Red Light Therapy: People with messed up sleep cycles like those who work shifts or have trouble sleeping, would benefit from red light therapy devices. These can help fix sleep patterns when used an hour before your intended sleep. Besides messed up sleept cycles, using red light an hour before bed will induce better and deeper sleep as it triggers the production of melatonin. This is useful, because it’s known as the sleep molecule.
Final Thoughts
Try using one of our red light therapy devices as shown on the right if you’re having trouble sleeping, we swear you’ll sleep better. And we have a 30 day money back guarantee. Now, it doesn’t take days or weeks to work. It works that same day you use it for sleep. The quality of our sleep has a strong connection to our light exposure patterns. To enhance your sleep and overall health, make natural light a priority during daytime hours and cut down on blue light at night. Even small adjustments to your light habits can lead to big improvements in your sleep.
