What circadian biology studies

Circadian biology is the science of how these internal clocks operate and how living in rhythm supports health and happiness. Every cell, tissue, organ, and system in the human body runs on circadian timing. These rhythms govern:

  • hunger and metabolism

  • body temperature

  • hormone and neurotransmitter production

  • immune function and inflammation

  • cardiovascular and muscular performance

  • stress response

  • cellular repair, recycling, and aging

From infancy and childhood through adolescence, adulthood, and old age, a healthy circadian rhythm is essential at every stage of life (13). When we live In Rhythm, we tap back into the natural patterns our biology was designed for—and health begins to return.

Our Published Schools Research

In early 2024, Daniel White (our Co-Founder) conducted a study where he provided circadian health interventions (education and blue light blocking glasses) to over 500 secondary students across seven UK schools.

The results showed significant improvements in sleep quality, alertness, focus, and emotional well-being, using simple, low-cost circadian health interventions (such as our education sessions and sleep tools).

“Siri, what is Circadian?”

Circadian
Origin (Latin):
Circa — about or approximately
Diem — day

Circadian rhythms are the body’s built-in 24-hour clocks—biological timing systems that keep us in sync with the rising and setting of the sun. These rhythms regulate almost everything our bodies do: when we feel awake or tired, hungry or satisfied, focused or foggy. In essence, they are the invisible forces organising our health, energy, mood, and performance.

Why circadian rhythm matters

Decades of research show that circadian disruption is linked to virtually every major chronic condition, as well as many acute issues throughout life. This includes mood disorders, ADHD, metabolic dysfunction, autoimmune conditions, skin problems, fertility challenges, arthritis, dementia, and more (1–12). When our internal clocks fall out of sync with the natural world, the systems they regulate begin to break down.

The good news: when we realign our lifestyles with nature—especially light exposure, daily routines, and sleep—we help restore our circadian rhythm, easing symptoms and improving long-term health.

Impact on Young People

Scientists are also pointing to just how important circadian rhythms are during key stages of childhood and adolescent development.

Recent research has shown that when these natural rhythms are disrupted, it can increase the risk of short- and long-term issues like problems with thinking and focus, low mood, tiredness, anxiety, sleep struggles, and even substance use (14, 15).

Learning to cultivate strong circadian health is one of the most impactful things to do for your health and well-being

Though often overlooked, your body’s internal rhythm plays a powerful role in how you feel, think, sleep, move and show up in the world, every single day.

At In Rhythm, we firmly believe that collectively addressing the root causes of disruptions to circadian health represents the next revolution for the health of you and your family.

That’s why we’re on a mission to provide you with cutting-edge, research-based health products, education and guidance to develop a circadian-aligned lifestyle that allows you to flourish, by honouring your natural biology.