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Circadian Chronobiology Atlas

Biological Clock

Real-time guide to your hormones, organ activity, and optimal timing for eating, training, cognitive work, supplements, and sleep — based on circadian chronobiology, endocrinology, and Traditional Chinese Medicine.

Deep SleepImmune RepairPre-Dawn RiseActivationCognitive PeakMental PeakDigestionCardio PeakStrength PeakWind DownPre-SleepSleep Onset00020406081012141618202224h Circadian
Testosterone Peak
06:00 – 08:00
800–1000 ng/dL
Cognitive Peak
08:00 – 12:00
Cortisol + Dopamine
Digestive Peak
12:00 – 14:00
HCl + enzymes max
Athletic Peak
14:00 – 18:00
VO2max + strength
Growth Hormone
22:00 – 02:00
15 ng/mL pulse
Deep Detox
00:00 – 04:00
Glymphatic + CYP450

Hormone Curves — 24h Profile

♂ Male
Cortisol
μg/dL
0006121824
Peak: 08:00 — 25 μg/dL
Testosterone
ng/dL
0006121824
Peak: 08:00 — 800 ng/dL
Melatonin
pg/mL
0006121824
Peak: 02:00 — 60 pg/mL
Growth Hormone
ng/mL
0006121824
Peak: 00:00 — 15 ng/mL (1st sleep pulse)

Traditional Chinese Medicine — Organ Clock

The TCM meridian clock maps each 2-hour window to a primary organ system. When symptoms recur at the same time daily, it indicates the corresponding organ needs support.

23:0001:00
Gallbladder
WoodIndecision → Courage

Bile production, cellular repair. Decision-making energy stored. Deep sleep required for regeneration.

01:0003:00
Liver
WoodAnger → Kindness

Blood detoxification at maximum. CYP450 enzyme activity peaks. Glycogen stores replenished. Alcohol/toxin processing.

03:0005:00
Lung
MetalGrief → Integrity

Oxygen distribution to tissues. Immune defense compounds released. Deep breathing repairs alveolar tissue.

05:0007:00
Large Intestine
大肠
MetalLetting Go → Receiving

Natural bowel movement window. Mineral absorption from colon. Electrolyte rebalancing. Best time for warm water.

07:0009:00
Stomach
EarthWorry → Centeredness

HCl production peaks. Protein digestion optimal. Gastric enzyme output at daily maximum. Nutrient extraction begins.

09:0011:00
Spleen
EarthOverthinking → Trust

Nutrient transport to cells. Blood quality regulation. Immune cell production. Thought processing and concentration.

11:0013:00
Heart
FireHatred → Joy

Cardiovascular peak efficiency. Blood circulation at maximum. Consciousness and awareness sharpest. Social connection.

13:0015:00
Small Intestine
小肠
FireInsecurity → Discernment

Nutrient separation and absorption. Sorting useful from waste. Mental discernment peaks. Avoid heavy meals.

15:0017:00
Bladder
膀胱
WaterFear (stored) → Peace

Fluid regulation and waste storage. Metabolic rate at peak. Salt/water balance. Hydration critical for detox.

17:0019:00
Kidney
WaterFear → Wisdom

Jing (vital essence) energy stored. Bone marrow production. Sexual vitality and willpower. Adrenal restoration begins.

19:0021:00
Pericardium
心包
FireVulnerability → Love

Emotional protection and processing. Heart envelope circulation. Intimacy and connection window. Blood pressure dropping.

21:0023:00
Triple Burner
三焦
FireHopelessness → Hope

Endocrine system harmonization. Body temperature regulation. Metabolism balancing across all systems. Sleep preparation.

24-Hour Detailed Timeline

♂ Male
|

Sources: Czeisler & Buxton (2017) Principles of Practice of Sleep Medicine — cortisol circadian rhythm. Luboshitzky et al. (2001) J Clin Endocrinol Metab — nocturnal testosterone pulsatility. Pandi-Perumal et al. (2007) Sleep Med Rev — melatonin circadian profile. Panda S. (2018) The Circadian Code — time-restricted eating. Walker M. (2017) Why We Sleep — sleep architecture. Maciocia G. (2015) The Foundations of Chinese Medicine — TCM organ clock.