Align Your Circadian Rhythm to Improve Your Health: Neuroscience-Backed Tips for Supporting Your Internal Clock
A practical guide to understanding your internal clock and using consistent wake times, natural light, movement, meal timing, and evening light habits to support circadian alignment.
By David DeBonis•9 min read•Updated August 27, 2026
Article compass: What you'll learn
What the circadian rhythm is and how it influences sleep, hormones, energy, appetite, body temperature, and mood
How environmental timing cues—especially natural light—help synchronize the internal clock
Why consistent wake times can provide an important anchor for the rest of the day
How movement, meals, daylight, and evening screen habits can reinforce daily biological rhythms
Educational content. Synthesis separates research findings, interpretation, and lived experience wherever practical; this article is not individualized medical advice.
The circadian rhythm has been extensively researched as a vital aspect of an organisms health and homeostasis. Our circadian rhythm impacts our sleep cycles, hormone release, appetite, digestion, mood, and body temperature.
Aligning our circadian rhythm is an invaluable way to optimize our health.
What is the Circadian Rhythm?
The circadian rhythm is our body’s natural cycle. It influences the regulation of sleep, hormone secretion, body temperature, energy, as well as other behavioral mechanisms like mood.
The word “circadian” derives from Latin: circa, which means “about,” and dies, which means “day;” thus, the circadian rhythm spans about one day in length.
Our circadian rhythms are controlled, or 'mediated,' by our “biological clock,” which scientists have discovered is primarily in the suprachiasmatic nucleus (SCN), a bundle of neurons in the hypothalamus (1).
The circadian rhythm is regulated by both internal and external factors:
Internal Factors Regulating Circadian Rhythm:
The internal processes of the circadian rhythm (in the SCN) are thought to be regulated by the clock gene, which regulates the production of proteins. The time it takes for these proteins to be produced and degraded is the base “unit” of time that our internal circadian rhythm is built from. Much like a second-hand on a clock, the expression of these proteins are the “ticks” of our circadian clock (1).
Thus, our circadian rhythm is somewhat self regulating, even independent of external factors. However, the ~24 hour cycle of the circadian rhythm is not accidental. It is deeply with the movement of the Earth around the sun, meaning external factors also regulate it.
External Factors Regulating Circadian Rhythm:
The body’s clock is also regulated with external factors called zeitgebers. In German, zeit is "time," geber is "giver," meaning a zeitgeber translates approximately to "time giver".
Zeitgebers are external factors that orient the body’s circadian rhythm and essentially ‘set’ the clock. The primary zeitgeber, or external synchronizer, is light. However, other factors such as food, exercise, and social interactions have also been recognized as zeitgebers (5, 8, 9).
Why should we care about the Circadian Rhythm?
Our circadian rhythms are important for regulating many aspects of our daily lives, such as body temperature, energy, and sleep. The circadian rhythm has also been found to elicit a noticeable effect on mood; most people with mood disorders demonstrate disruptions in circadian rhythms (4).
The monoamines (serotonin, dopamine, and norepinephrine) are hypothesized to be responsible for mood and anxiety disorders. These neurotransmitters also function on a circadian cycle that cycles in relationship with the circadian rhythm.
Additionally, hormones also correlate with mood and anxiety disorders; hormones also function on circadian cycles. For example, Cortisol is known to spike within 30 minutes of waking up. This is known as the Cortisol Awakening Response, which is also modulated by the circadian rhythm (10).
Yet, in modern society it is difficult for us to align our external circadian factors with our innate, internal rhythm. This is because we are hard pressed to meet busy schedules that cause us to sleep, exercise, eat, socialize, and work at odd hours.
"Aligning our circadian rhythm is an invaluable way to optimize our health"
There is also increased exposure to artificial light and blue light (as well as less exposure to daylight), which negatively affects our circadian rhythm, and thus negatively afects our sleep/wake cycles and circadian synchronization.
Desynchronization of external factors can also interfere with cognition (specifically reaction time, vigilance, motivation, and memory). Studies on rats and hamsters have demonstrated that circadian disruptions (typically light/dark cycles) impair learning and memory (3).
It thus becomes apparent that many potential health benefits could be derived from synchronizing our external factors (zeitgebers) with our bodies’ internal rhythms.
This post will propose a potential plan to improve circadian alignment and thus improve downstream health benefits. Some day, deeper analyses will be provided that address these specific health benefits, such as mood and sleep.
How can I align my circadian rhythm?
A few years back, when I was in college, I had a conversation with professor Ben Greenwood, who leads the Exercise and Behavioral Neuroscience Lab at the University of Colorado, Denver. He expressed that, after waking up at the same—or at least a similar—time every day is one of the most important activities one can do to improve their circadian rhythm. He then explained that, after waking up at the same time, many neuroscientists and physiologists have adopted the following habits to improve their circadian rhythm and thus their physical and mental health:
Exercise (preferably moderate-intense exercise).
Eat a large meal. (frontload a chunk of calories for that day.
Expose yourself to natural daylight.
According to many people in the neuroscience field, if these habits are completed within the first hour or two of awakening, the habits can help synchronize the circadian clock.
As we saw above, all of these habits are examples of zeitgebers. By exposing yourself to these zeitgebers at the same time every day, your internal circadian rhythm will adapt to synchronize with these zeitgebers, which may help increase your mood and energy levels. More than anything, though, aligning these zeitgebers can help you fall asleep faster, sleep more efficiently, and obtain higher quality sleep (1).
And, regardless of the benefits these practices could have on circadian clock synchronization, including all of these healthy habits in your day will surely help you to feel better. Exercise helps improve mood, reduce anxiety, and improves cognition & neurogenesis; eating a large, healthy meal offers sustainable energy; exposure to natural daylight, as we know well, doses us with vitamin D!
Since this conversation with Dr. Greenwood I have spent a lot of time playing with this thought and experimenting with how different zeitgebers interact with my own sleep/wake cycle. Utilizing the aforementioned recommendation, some research, and anecdotal experience, I have developed a list of things that help to synchronize the circadian rhythm and hence improve overall physical and mental well-being.
5 Steps to Synchronize Your Circadian Rhythm
1. Wake up at the same time every day
This is a habit that can be hard to develop, especially considering the bounds of our societal habits and responsibilities. Work, school, family obligations, and social participation are all factors that are sometimes out of our control.
However, I have found that if you wake up consistently within the range of an hour (say, between 5 and 6 a.m.), it can enhance your mood and productivity.
2. Expose yourself to natural as soon as you can.
Light is the primary zeitgeber that sets our circadian clocks. Many cases of insomnia can be traced to lack of exposure to natural daylight during the day and too much exposure to artificial light at night!
3. Move or Exercise in the A.M.
Moderate-intense exercise is always preferred. I like to run a few miles (which—during the summer especially—works swimmingly because then I knock out steps 3 and 4 at the same time). Otherwise I might go to the gym or do a calisthenics workout or some primal movements.
And, even on days when I’m not feeling up to it or I don’t have time, I try to shadowbox for 10 minutes then do some stretching to get my blood flowing.
4. Eat a Large Meal Every Morning.
I recommend eating food that burns slow and will last. In my experience, if I eat oatmeal and berries, my blood sugar will spike which will guarantee a crash. I like to eat Paleo and Keto based breakfasts because they help with my physical energy & my cognition.
5. Shut the Screens off an hour before bed
As mentioned above, many cases of insomnia can be traced to lack of exposure to natural daylight and too much exposure to artificial light, especially at night. Turning off the screens before bed allows your internal clock to 'sync up' with the nighttime. I also love to turn the red light on my devices in the evening.
Summary of Circadian Rhythm
Understanding and aligning with your circadian rhythm can significantly enhance your sleep quality, energy levels, and overall well-being. By integrating simple habits like consistent wake times, exposure to natural light, and mindful exercise, you can foster a natural balance that supports your body's innate rhythms.
Small adjustments in daily routines can lead to profound improvements in how you feel and function. Prioritize your health by listening to your body's signals and nurturing a lifestyle that resonates with your internal clock.
References
Carlson, N. R. (2014). Foundations of Behavioral Neuroscience (9th ed.). Upper Saddle River: Pearson.
Circadian. (1989). In Oxford English dictionary online (2nd ed.), retrieved from https://oed.com/
Golombek, D. A., Casiraghi, L. P., Agostino, P. V., Paladino, N., Duhard, J. M., Plano, S. A., & Chiesa, J. J. (2013). The times they’re a-changing: Effects of circadian desynchronization on physiology and disease. Journal of physiology—Paris, 107(4), 310-322.
McClung, C. A. (2013). How Might Circadian Rhythms Control Mood? Let Me Count the Ways... Biological psychiatry, 74, 242-249.
Monk, T. H. (2010). Enhancing circadian zeitgebers. Sleep, 33, 509-514.
Münch, M., & Bromundt, V. (2012). Light and chronobiology: implications for health and disease. Dialogues in clinical neuroscience, 14(4), 448–453. https://doi.org/10.31887/DCNS.2012.14.4/mmuench
The circadian rhythm is the body’s natural approximately 24-hour cycle. It helps regulate sleep and wakefulness, hormone secretion, body temperature, energy, appetite, digestion, and aspects of mood and behavior. Circadian rhythms are coordinated by the body’s biological clock, including the suprachiasmatic nucleus (SCN) in the hypothalamus, and are synchronized with the outside world through environmental cues called zeitgebers.
What are zeitgebers, and how do they affect the circadian rhythm?
Zeitgebers are external signals that help orient or “set” the body’s circadian clock. The word comes from German and roughly means “time giver.” Light is the primary zeitgeber, but food timing, exercise, and social interactions can also provide timing information to the body. Consistently exposing yourself to these cues at similar times each day may help synchronize your internal rhythm with your environment.
How can I align my circadian rhythm naturally?
Start by waking at approximately the same time each day and exposing yourself to natural daylight as early as practical. Morning movement or exercise and relatively consistent meal timing can provide additional timing cues to the circadian system. At night, reducing bright artificial light and shutting off screens before bed can help reinforce the transition from daytime activity to nighttime sleep.
The circadian rhythm has been extensively researched as a vital aspect of an organisms health and homeostasis. Our circadian rhythm impacts our sleep cycles, hormone release, appetite, digestion, mood, and...
The circadian rhythm has been extensively researched as a vital aspect of an organisms health and homeostasis. Our circadian rhythm impacts our sleep cycles, hormone release, appetite, digestion, mood, and...
