デイヴ・アスプリーのインスタグラム(dave.asprey) - 10月13日 10時00分

Fall has us fully in its clutches. It's getting darker earlier and that means our circadian rhythms will be adjusting according to the length of sunlight our brain processes. So it is ever more important to be present to the #junklight around us (environment stress) and participate in the natural rhythm of nature. And if you can't be in nature in the amazingness of its rhythm then grab a pair of @TrueDark glasses to help you and here's why. . .

Researchers at the RIKEN Brain Science Institute in Japan discovered a key mechanism that explains how the brain uses circadian rhythms and length of day to synchronize with the seasons.

In the new study, the researchers identified a mechanism that encodes the length of a day into the neuronal network of the suprachiasmatic nucleus (SCN). The researchers were able to identify how circadian clock machinery in the brain encodes seasonal changes based on the amount of daylight hours.

The suprachiasmatic nucleus is our master circadian clock. The SCN is also a seasonal clock that measures the length of daylight. The human brain keeps track of the seasons using the same nucleus of neurons that govern circadian rhythms. The SCN contains about 20,000 nerve cells and is located in the hypothalamus. The SCN takes the information on the length of day and night from the retina, interprets it, and passes it on to the pineal gland. In response to these signals from the SCN, the pineal gland secretes the hormone melatonin.

The secretion of melatonin peaks at night and ebbs during the day which drives our sleep and wake cycle. Destruction of the SCN results in the complete absence of a predictable sleep and wake cycle.

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