For the Girl Who Knows She's Worth More Than Sleepless Nights

The Body That Keeps Time by Myah Jeanné, Functional Nutrition Counselor 

There is a rhythm running beneath your thoughts, beneath your hormones, beneath your hunger and your fatigue known as your circadian rhythm.

In 2017, the Nobel Prize in Physiology orMedicine was awarded for discoveries explaining the molecular mechanisms behind our internal biological clock. 

Scientists confirmed what ancient systems found centuries ago in the Chinese Body Clock: every organ in the body runs on a timed schedule.

• Your liver detoxifies differently at night than during the day.

• Your thyroid-stimulating hormone peaks around 2–4 AM.

• Your colon wakes up with you in the morning.

• Your heart tolerates stress better in the afternoon.

• Your brain clears waste while you sleep.

  
  

They proved that many aspects of the Chinese Body Clock were molecularly

correct.

Nearly every cell contains clock genes that switch thousands of genes on and off depending on time of day (Takahashi, Science, 2017; Mure et al., Science, 2018). In fact, up to 40–50% of genes in certain tissues work on a 24-hour cycle (Zhang et al.,PNAS, 2014).

The body does not function the same at midnight as it does at noon. And yet most of modern life ignores that.

• Late-night scrolling.

• Midnight snacks.

• Indoor lighting at all hours.

• Irregular sleep.

  
  

When we override circadian rhythm, the first systems to feel it are hormonal and metabolic:

thyroid disruption, insulin resistance, cortisol imbalance, inflammatory disorders. Many

disorders that are linked to downstream diseases like PCOS and diabetes.

Instead of obsessing over productivity hacks, imagine building one small habit each week that honors your biological clock and restores the foundation of the body.

Below is a practical rhythm, rooted in research, that you can layer gradually.

A Day in the Life of a Circadian-Aligned Body:

6:00–8:00 AM: Wake + Light + Metabolic Activation

Cortisol naturally surges within 30–45 minutes of waking (the “cortisol awakening response”). This helps regulate blood sugar and alertness. Colonic motility also increases sharply after waking. Your body is primed for elimination.

(Rao et al., Gastroenterology, 2001).

Habits to Build:

✔ Drink water within 5 minutes of waking

✔ Eat protein + fiber within 30–60 minutes

✔ Get natural sunlight in your eyes within 10–20 min.

Sunlight anchors your master clock (SCN) and stabilizes thyroid and cortisol rhythms.

10:00 AM–2:00 PM: Cognitive + Digestive Peak

Insulin sensitivity is highest earlier in the day.

Digestive enzymes and bile production are strong.

Habits to Build:

✔ Prioritize a larger meal at lunch vs. dinner prioritizing 

     healthy fats (like avocado), fiber (like brown rice), 

     and protein (prioritize local and organic).

✔ Take a 10-minute walk after eating

2:00–5:00 PM; Muscle & Cardiac Strength

Muscle performance peaks in the late afternoon. Cardiac tissue tolerates stress better during afternoon hours, and pain sensitivity is lowest later in the day.

(Reilly et al., Chronobiology International, 2005).

(Thosar et al., J Clin Invest, 2018).

Habits to Build:

✔ Schedule strength training here or go on a walk! (if 

     not afternoons, prioritize mornings over evenings)

✔ Do focused work requiring endurance

✔ Step outside for another light exposure reset

Afternoon light also strengthens nighttime melatonin release.

6:00–9:00 PM: Melatonin Preparation

Melatonin begins rising around 2–3 hours before natural sleep onset. Artificial blue light suppresses it.

Habits to Build:

✔ Put on blue light glasses at 6 PM (or when sunsets)

✔ Dim overhead lights & put a red filter on all electronic 

     devices (or put them away when sun goes down!)

✔ Eat your final meal 2–3 hours before bed

✔ Take a slow 10-minute walk after dinner

10:00 PM–2:00 AM: Deep Repair Window

During early deep sleep, your growth hormone surges, immune repair activates, liver detoxification increases, brain lymphatic waste clearance rises, and TSH peaks around 2–4 AM. Sleep deprivation stunts this.

(Brabant et al., JCEM, 1990).

Habit to Build:

✔ Be in bed by 9:30–10:00 PM

✔ Keep room cool and dark

✔ Avoid alcohol within 3 hours of sleep

This is not about perfection. It is about protecting the most biologically sacred hours of the day.