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Siim Land@siimlandX

The human body has a circadian rhythm with fluctuations in hormones, body temperature, and blood pressure Here's a graph for the most …

what it claims

The human body follows a natural circadian rhythm that regulates hormonal fluctuations, such as the morning peak in cortisol and testosterone.

holds up

This statement is based on solid foundations of chronobiology. Science confirms that the circadian cycle, orchestrated by the suprachiasmatic nucleus, synchronizes our biological…

noli's read

This statement is based on solid foundations of chronobiology. Science confirms that the circadian cycle, orchestrated by the suprachiasmatic nucleus, synchronizes our biological processes over 24 hours. The literature, notably systematic reviews on the hypothalamic-pituitary-adrenal axis, confirms the cortisol awakening response (CAR), which generally peaks between 30 and 45 minutes after waking, and testosterone also shows pulsatile secretion with a morning predominance in men. What Siim Land describes is a well-documented physiological mechanism. It is, however, useful to specify that these rhythms are not rigid: they vary according to age, genetics (chronotypes), and light exposure. There is no exaggeration here; it is a factual description of the organism's normal functioning.

the sources

Claimed by Siim Land. Noli grades the claim, never the person.

Decoded by Noli · July 18, 2026 · the original post

What the graded evidence says

Evidence: A-

Effect: circadian phase / melatonin timing — morning light advances; evening light delays
Measured on: reviews + expert consensus

Core circadian physiology is very well established; specific lux targets less so.

Siim Land in the Register50 claims graded · solidity 79/100See their record →

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Noli has read similar claims

Other advice in the Register that leans on the same research.

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