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What Color Light Helps You Sleep Better (According to Science)

Written by AYO Team

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What Color Light Helps You Sleep Better (According to Science)
Table of contents

Key Takeaways

  • Morning blue light actually helps you sleep better by advancing your circadian rhythm. The same light that improves sleep when used in the morning will keep you awake for hours if encountered in the evening.
  • Red light doesn’t suppress melatonin production, making it ideal for nighttime use. Amber lights block sleep-disrupting wavelengths while providing enough illumination for evening activities like reading.
  • Your circadian rhythm thrives on consistent light timing rather than sporadic changes. Start with one simple switch—use warm lights 2-3 hours before bed—and maintain the same schedule every night for best results.

You dim the lights, put away your phone, and settle into bed at 10 PM. But by 11:30, you’re still wide awake, frustrated, and counting the hours until your alarm rings.

Surprisingly, the culprit might not be stress, caffeine, or that late dinner.

Recent research points to something simpler: The colors of light you’re exposed to throughout the evening might be sending your brain mixed signals about when it’s time to sleep.

This guide reveals exactly which light colors research proves will improve your sleep, why timing matters more than you think, and how to implement these findings tonight for better rest.

 

Did you know?
People with bright days and dark nights could be living up to five years longer than people with bright nights and dark days.

How Light Affects Your Sleep

Your body runs on an internal clock, called the circadian rhythm—a 24-hour cycle that determines when you feel alert and sleepy.

This biological timekeeper relies heavily on light cues to stay synchronized with the natural day-night cycle.

When light hits your eyes, specialized cells called intrinsically photosensitive retinal ganglion cells detect it and send signals directly to your brain’s master clock in the hypothalamus.

This process controls the release of melatonin, which makes you feel drowsy.

Here’s where it gets interesting: these light-detecting cells don’t respond equally to all colors.

They’re most sensitive to blue light wavelengths and minimally respond to red light.

This means different light colors can either support your natural sleep cycle or completely disrupt it.

In our ancestors’ time, this system worked perfectly.

Bright blue-rich sunlight during the day kept them alert, while the warm orange glow of firelight in the evening allowed melatonin production to begin naturally. But modern life has complicated this simple equation.

Today, we’re surrounded by artificial lights that can confuse our internal clocks.

LED bulbs, fluorescent lighting, and electronic screens emit significant amounts of blue light, potentially keeping our brains in “daytime mode” long after the sun sets.

The Best Colors for Sleep

Blue Light

Morning blue light therapy has been proven to advance circadian rhythms and improve sleep timing.

Research shows that just 30 minutes of blue light exposure after waking helps people fall asleep earlier at night and sleep more soundly.

During the day, blue light can improve performance and attention, tuning our circadian rhythms and setting us up for a better night’s sleep after the sun sets.

Light therapy devices that emit the equivalent of 10,000 lux of blue-enriched light for 30 minutes each morning have shown remarkable results for people with delayed sleep phase disorder and “social jetlag.”

Clinical studies demonstrate that morning blue light therapy supports sleep-advancing protocols by phase advancing both circadian rhythm and sleep timing.

The key is timing.

The same blue light that helps you sleep in the morning will keep you awake for hours if used in the evening.

Red Light

Red light does not affect circadian rhythms, making it one of the best lights to use at night, especially to fix skin issues.

Research consistently shows that red light wavelengths (620-750 nanometers) don’t suppress melatonin production, allowing your body’s natural sleep processes to continue uninterrupted.

Amber/Orange Light

Clinical trials show that wearing amber-tinted glasses for just two hours before bed helps people get around 30 minutes extra sleep and report greater sleep quality.

Amber light (1600-2700K) blocks blue wavelengths while providing enough illumination for evening activities like reading.

Yellow Light

Dim yellow and orange colored lights have little impact on the circadian rhythm and are good options to use at night.

Yellow light offers a candlelight-like quality that promotes relaxation without eliminating visibility.

Did you know?
Your natural rhythm tells you to sleep twice; once at midday and once at night. This is why so many European and Asian cultures observe an afternoon nap.

The Worst Colors for Sleep

Green and White Light

Green light can disrupt sleep by decreasing drowsiness, though not as powerfully as blue light.

Like blue light, green light also decreases drowsiness when used in the evening.

Any light that appears bright white or has a “cool” tone is likely rich in sleep-disrupting wavelengths and should be avoided in the hours before bedtime.

Practical Implementation Tips

Morning Routine

Start your day with 20-30 minutes of bright blue light exposure within an hour of waking.

Light therapy devices that emit the equivalent of 10,000 lux work best, but even sitting by a sunny window or taking a morning walk can help. This daily practice advances your circadian rhythm, making falling asleep at your desired bedtime easier.

For shift workers or people with delayed sleep phase, consistency is key.

To maintain circadian alignment, use your blue light therapy at the same time each morning, even on weekends.

Evening Lighting

Begin transitioning to warmer light colors 2-3 hours before your target bedtime.

Replace standard LED bulbs in your bedroom and main living areas with amber or red-spectrum bulbs rated below 3000K. Look for bulbs labeled “sleep-friendly” or “blue-light blocking” to ensure they don’t emit hidden blue wavelengths.

For reading or other evening activities, position amber table lamps at eye level rather than overhead lighting, which can be too stimulating even in warm tones.

Smart Solutions

Smart lighting systems can automate these transitions.

Program your lights to gradually shift from bright white during the day to warm amber in the evening, mimicking natural sunset patterns.

Many systems allow you to create custom schedules that align with your sleep goals.

Blue Light Blocking Glasses

If you must use screens in the evening, amber-tinted blue light-blocking glasses provide a backup solution.

Standard white LED bulbs create a particularly complex problem for sleep. While they appear neutral, white light combines all visible wavelengths, including sleep-disrupting colors. According to research, white light significantly impacts mood and alertness, making white bulbs a poor choice for evening bedroom lighting.

White light’s bright, energizing quality signals your brain to stay alert rather than prepare for rest. Even dimmed white lights can interfere with your body’s natural transition to sleep mode.

Did you know?
Less than 15 minutes of exposure to bright light at night can completely halt the production of melatonin.

Common Mistakes to Avoid

Relying on Overhead Lighting at Night

Even warm-colored overhead lights can be too bright and stimulating before bed.

The downward angle creates harsh shadows and higher light intensity at eye level. Instead, use table lamps, floor lamps, or wall sconces positioned below eye level to create a gentler lighting environment.

Inconsistent Light Timing

Your circadian rhythm thrives on consistency.

Using blue light therapy sporadically or switching between different evening lighting colors confuses your internal clock.

Stick to the same lighting schedule seven days a week, including weekends, to maintain optimal sleep-wake timing.

Ignoring Hidden Light Sources

Many people focus on main lights while overlooking LED alarm clocks, charging device indicators, or light leaking from other rooms.

These small blue light sources can still disrupt sleep. To eliminate all sleep-disrupting wavelengths, use blackout curtains, cover LED displays, or switch to red-light alarm clocks.

Expecting Instant Results

Light-based sleep improvements typically take 1-2 weeks of consistent implementation to show full effects.

Don’t abandon your new lighting routine after just a few nights, your circadian rhythm needs time to adjust to the new schedule.

Your Sleep Solution Starts Tonight

The science is clear: blue light in the morning sets you up for better sleep at night, while red and amber lights in the evening support your body’s natural wind-down process. It’s not about avoiding all light, it’s about using the right colors at the right times.

Start by switching your bedroom lighting to red or amber bulbs 2-3 hours before bed.

Add morning blue light exposure within a week, and you’ll likely notice faster sleep onset and better sleep quality.

Want to learn more about lights and circadian health? Check out our blog here.

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