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AYO Light Therapy · Circadian Science for Better Sleep

Most sleep problems aren't sleep problems.They're timing problems.

Waking through the night, daytime fatigue, and feeling unrested after a full night's sleep are often signs of a misaligned circadian rhythm, not poor sleep itself.

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Educational guide
Say Hello to Quality Sleep
AYO Wearable Can Boost Your Winter Productivity
Best Light Therapy Product 2021
AYO Is My Secret Weapon When The Days Get Shorter
A Session Of Blue Light Will Help Correct The Body's Circadian Rhythm.
It’s Like A Wearable And Non-Addicting Version Of Caffeine, Without The Crash
With AYO, I Fall Asleep And Stay Asleep Almost Instantly.
Say Hello to Quality Sleep
AYO Wearable Can Boost Your Winter Productivity
Best Light Therapy Product 2021
AYO Is My Secret Weapon When The Days Get Shorter
A Session Of Blue Light Will Help Correct The Body's Circadian Rhythm.
It’s Like A Wearable And Non-Addicting Version Of Caffeine, Without The Crash
With AYO, I Fall Asleep And Stay Asleep Almost Instantly.
Recommended By Sleep Physicians

Trusted by the doctors who treat sleep problems for a living.

“I encourage many of my clients to use blue light to boost their sleep health and their circadian rhythms, and the AYO device is the model I use myself”

Brad Wolgast, PhD, CBSM, DBSM
Licensed Psychologist Board Certified in Behavioral Sleep Medicine

AYO is a smart, well-designed tool for supporting healthy circadian rhythms. I appreciate the thoughtful design and often recommend it to my clients. AYO's genuine commitment to helping people improve their sleep and mood truly stands out.”

Annie Miller, LCSW-C,
Behavioral Sleep Medicine Specialist

"AYO applies decades of circadian rhythm research in a form patients can easily use—whether they’re at home, at work, or traveling across time zones."

Dr. Sidney Iriana, MD,
Board-certified Sleep Medicine and Internal Medicine Physician
Recognize yourself?

Does this sound familiar?

Sleep problems don't always look like insomnia. They often look like this:

You sleep 7 or 8 hours but still wake up tired.
You wake up between 2am and 4am and can't fall back asleep easily.
You feel exhausted by mid-afternoon, even on a quiet day.
You rely on melatonin, magnesium, or other sleep aids and still don't feel fully rested.
You sleep enough on paper, but you never feel restored.
Your sleep timing feels off, you can't quite settle at night, can't quite wake up in the morning.

If any of these sound like you, you're not alone, and you're probably not broken. What you may be experiencing is something most sleep advice never addresses: a circadian rhythm that has lost its timing.

Recommended by 1000+ of sleep physicians and experts

The Science

Most sleep problems start before bedtime.

Your body has an internal clock. Researchers call it the circadian rhythm. It runs on a roughly 24-hour cycle, and it has one main job: figure out what time of day it is, so it knows when to release the hormones that make you alert in the morning and the hormones that make you sleepy at night.

This clock is set by one primary signal. Light.

Specifically, bright light reaching your eyes in the first hour or two after you wake up. That signal tells your body, "the day has started." From that moment, your body begins a countdown. Roughly 14 to 16 hours later, it releases melatonin, your natural sleep hormone, and tells you it's time to sleep.

When this signal is weak when your mornings are spent indoors, under indoor lighting that's a fraction of the brightness your eyes need the countdown never starts properly. Your body spends the day uncertain whether it's morning, afternoon, or still the middle of the night. And when bedtime comes, the timing your body needs to release melatonin smoothly isn't there. So you lie awake. Or you fall asleep but wake at 3am. Or you sleep through the night but never feel rested.

This isn't a failure of willpower or sleep hygiene. It's a timing problem.

How much light does your body actually need?
Indoor lighting 100–500 lux
Signal your body needs to register "morning" 2,500+ lux
Sunlight ~10,000+ lux