Key Takeaways
- If you want to sleep well have consistent energy levels, and mood, you need to consistently keep your circadian rhythm in check.
- Light and dark exposure are key triggering factors when it comes to your circadian health.
- Circadian health affects more than just your sleep. It may be responsible for many mental health, cognitive, and health issues like obesity and depression.
The answer to all those questions is circadian health.
What Is Circadian Health
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Regulates sleep and wakefulness at appropriate times.
- Produces hormones at the right moments.
- Maintains stable energy levels throughout the day.
- Controls body temperature fluctuations.
- Manages hunger and digestion cycles.
- Coordinates cognitive performance and alertness.
The Difference Between Circadian Rhythm and Circadian Health
While often used interchangeably, circadian rhythm and circadian health are distinct concepts.
Your circadian rhythm is the biological process – your internal 24-hour clock regulating sleep, hormones, and other bodily functions.
How Does Circadian Health Work?

Circadian health revolves around several biological clocks throughout the body, all coordinated by a master clock in the brain called the suprachiasmatic nucleus (SCN).
Your body relies on environmental cues called zeitgebers to maintain proper alignment.
Additionally, every major organ and tissue in your body contains its own biological clock.
Chronobiology and Genetics: The Science Behind Circadian Health
Chronobiology, the study of biological rhythms in living organisms, reveals that circadian health is deeply rooted in your genetic makeup.
These genes create proteins that rise and fall in a rhythmic pattern, controlling various aspects of physiology. The most well-known are the PER and CLOCK genes, which work together to regulate circadian timing.
Your genetic profile influences whether you’re naturally an early bird (morning chronotype) or a night owl (evening chronotype).
What Happens When Your Circadian Health Is Off?
Conversely, poor circadian health causes a lot of issues to your body, such as:
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Sleep disorders: Improper circadian health makes it a lot harder to fall asleep, which can lead to insomnia, and irregular sleep-wake patterns.
- Mental health issues: Irregular sleep makes you more prone to depression, anxiety, and mood disorders.
- Cognitive issues: Poor circadian health can lead to reduced concentration, memory problems, and decreased cognitive performance.
- Health disorders: Out-of-synch circadian health increases the risk of significant health issues such as obesity, diabetes, and heart attacks.
- Fatigue: When you don’t sleep well, you’re not rested enough, leading to significant fatigue and decreased energy levels.
But, what causes poor circadian health?
The major factors are typically:
- Consistent travel across time zones
- Shift work
- Illness
- Stress
- Excessively bright sleep environment
- Social/study habits leading to irregular bedtimes
How to Maintain Proper Circadian Health

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Keeping a regular schedule: When possible, keep a regular schedule for most parts of your life, such as meal times. If you usually have breakfast, lunch, and dinner, try having all three around the same time.
- Establishing a regular sleep routine: Try going to bed and waking up at the same time every day, even on weekends. Of course, weekends can be an issue to keep regular, but try to stick to as much of a regular sleep routine as possible for at least six days a week.
- Physical activity: Exercising regularly helps your body in many different ways, one of which is your circadian health. Exercise regularly throughout the week, even if it’s just light physical activity.
- Optimizing your sleep environment: Keep your bedroom as dark and quiet as possible, and also cool (18-19°C). For example, you could use blackout curtains, earplugs, and a sleep mask.
- Limiting blue light exposure: The light from your screen can impact your circadian rhythm, especially for long periods and before bedtime. Reduce or eliminate screen time from phones, tablets, and computers at least an hour before bedtime. Ideally, avoid using such devices during this time.
- Morning light exposure: Get outside for at least 30 minutes after waking up. It’ll significantly improve your circadian health, and sunlight has been shown to help with mood and energy levels.
- Healthy diet: Avoid heavily processed foods, heavy meals, caffeinated drinks, and alcohol close to bedtime.
- Relaxation techniques: Incorporating relaxation techniques can help support your sleep quality. Try incorporating meditation, breathing exercises, or yoga into your daily routine. For example, 10 minutes of daily meditation is enough to start.
- Limiting naps: Who doesn’t love a good, refreshing nap in the afternoon? Naps are great for the most part, but be careful not to have too many. If you need a nap, make sure it’s no longer than 20-30 minutes, and avoid napping late in the day, as it can make falling asleep a lot harder.
- Hydrate: Drink enough water during the day but reduce liquid intake in the evening to avoid frequent night-time trips to the bathroom.
- Mind your body temperature: Warm showers or baths before bed are great as they help your body cool down and relax, signaling your brain it’s time to sleep.
- Managing stress: Try to manage your stress before bedtime. The more stressed you are before going to sleep, the easier it’ll be to disrupt your sleep.
How to Fix Disrupted Circadian Health
And if yours is out of sync too, here are some ways to fix it:
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Light therapy: Blue light therapy (not the same blue light from your smartphone) is a common treatment for disrupted circadian health. This procedure involves exposure to a specific light that mimics natural sunlight. Controlling exposure to light can alter melatonin production and fix your disrupted circadian health. Light therapy is often accomplished through a lightbox or blue light therapy glasses.
- Supplements: One of the first things you’ll hear a person with insomnia do is take melatonin supplements. With melatonin supplements, correct timings and dosage can make a big difference in the effectiveness of the treatment, so ask your doctor for advice before trying this therapy. Melatonin supplements are not suitable for children.
- Consistent sleep schedule: One of the easiest ways to fix your disrupted circadian health is to adjust your sleep schedule. Write down your typical daily routine, including your work shifts and social gatherings, and create a sleep plan that allows you to be consistent.
How Circadian Health Affects Your Body
Your digestive system also operates on a circadian schedule. The gut has its own biological clock that influences nutrient absorption, metabolism, and the gut microbiome.
The Impact of Circadian Health on Sleep

If you struggle to fall asleep at night or wake up feeling exhausted, your circadian health is probably disrupted.
As darkness falls, the SCN releases the break on the pineal gland (as it happens during the daytime because of daylight) which leads to the release of melatonin, the primary hormone that signals darkness to the body .
Circadian Health and Energy Levels
Dips in energy throughout the day can happen, especially the afternoon energy dip, which is a regular part of your circadian rhythm function.
But when these lows happen too often or are severe, poor circadian health might be the reason.
When your circadian health is disrupted, you feel fatigue and low energy.
Why is that?
Your circadian rhythms regulate the timing of hormone release, body temperature, and other physiological processes.
For example, circadian rhythms regulate cortisol, which helps you feel awake and energetic.
It peaks in the morning and gradually decreases throughout the day.
Circadian and Mental Health
Your circadian health plays a vital role in mental health – when your internal clock is disrupted, it can affect your psychological well-being in numerous ways.
Seasonal Affective Disorder (SAD) demonstrates one of the most apparent links between circadian health and mental wellbeing.
During darker winter months, reduced sunlight exposure can disrupt your circadian system, leading to depression symptoms that typically improve in spring and summer. This is especially common in regions far from the equator, where seasonal light changes are more dramatic.
Circadian Health Across Life Stages
Infants and Young Children start life without a precise circadian rhythm.
Newborns sleep in shorter bursts throughout the day and night, gradually developing more regular patterns around 3-6 months.
Young children typically need more sleep and tend toward earlier bedtimes. Their circadian rhythms are strongly influenced by light exposure and family routines.
Teenagers experience a natural shift in their circadian rhythm, making them naturally inclined to stay up and wake up later. This biological change often conflicts with early school start times, leading to chronic sleep deprivation. During these years, the body clock can shift by up to two hours, making it difficult for teens to fall asleep early.
Though individual differences remain significant, adults generally develop more stable circadian patterns.
Work schedules, family responsibilities, and social obligations often challenge natural rhythms. Women may experience additional circadian disruptions due to hormonal changes during menstruation, pregnancy, and menopause.
Older Adults tend to shift toward earlier wake and sleep times.
They might naturally wake up at dawn and feel sleepy in the early evening. Aging can also make circadian rhythms more fragile, leading to more sleep disruptions and greater sensitivity to changes in routine.
Cultural and Geographic Factors also influence circadian health:
- Different societies have varying meal times and work schedules.
- Latitude affects natural light exposure patterns.
- Cultural practices like siestas align with natural afternoon energy dips.
- Urban versus rural environments create different circadian challenges.
Modern Life and Circadian Health
Modern lifestyles often conflict with our natural circadian rhythms.
From artificial lighting to international travel, contemporary life introduces numerous disruptions to our internal clocks.
Social Jet Lag, the mismatch between our biological clock and social obligations, affects many people who maintain different schedules on workdays versus free days.
This weekly rhythm disruption can impact health similarly to regular jet lag, leading to fatigue, mood changes, and decreased performance.
The rise of remote work has introduced new circadian challenges as well.
While flexible schedules can allow better alignment with natural rhythms, the blurred boundaries between work and personal time often lead to irregular sleep patterns and extended screen time exposure.
Urban environments present their own set of challenges too.
Light pollution, noise, and the 24/7 culture of cities can make it difficult to maintain regular circadian rhythms. Meanwhile, shift work affects millions globally, forcing many to operate against their natural biological timing.
Frequent travel across time zones disrupts circadian rhythms through jet lag, requiring careful management strategies.
Technology and Circadian Health

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Blue Light Therapy Glasses: These glasses simulate sunlight with a gentle blue light that enters your eyes and stimulates sensory cells in the retina called photosensitive Retinal Ganglion Cells (ipRGCs). This sends a biological signal through the optic nerve towards your body’s master clock located in your brain. Be aware that time of day is of utmost importance when using these devices.
- Light Therapy Lamps: Light therapy lamps are stationary devices similar to light therapy glasses and you’d typically place these lamps in your bedroom – but only use them in the morning. They work by simulating natural sunlight, helping you regulate your circadian health. Light therapy lamps are handy for combating SAD.
- Wearable Sleep Trackers: These portable devices monitor your sleep patterns and provide detailed insights to help improve sleep hygiene.
- Circadian Health Apps: These apps help you align daily activities with your circadian health and rhythm by providing personalized sleep, meals, and exercise recommendations.
- Sleep Environment Optimizers: These gadgets improve your sleep environment by controlling temperature, humidity, light, and noise levels to help you sleep better. For example, there are specific mattresses that regulate optimal sleep temperature or air purifiers that clean the air while you sleep.
Embrace Your Circadian Health
If you’re having issues with your circadian health, our blue light therapy glasses can help.
You can also learn more about circadian health on our blog.