Optimal health requires circadian alignment. Inspired by chronobiology and Shabbat’s 25-hour tradition, shifting to 25-hour days aligns rhythms with lunar cycles. This change may lower circadian rhythm disruption (CRD) disease risks and unlock multiple daily ‘biological prime time’ windows for enhanced well-being and performance.

25-Hour Days​

A 25-hour day, inspired by Shabbat and lunar cycles, might align better with lunar days, which are approximately 24 hours and 50 minutes, compared to the conventional 24-hour solar day. The “human free-running period,” which is our natural circadian rhythm when isolated from external light and other Zeitgebers, varies among individuals but can extend up to approximately 25.5 hours. Adjusting to 25-hour days while eliminating Daylight Saving Time might further support health and well-being by ensuring a more natural alignment with our internal biological clocks.

Potentially Lowering Health Risks

Circadian Rhythm Disruption (CRD) is linked to neurologic, psychiatric, cardiometabolic, and immune disorders. A 25-hour day, inspired by Shabbat and lunar cycles, might reduce these risks. It could also improve gut microbiota health, potentially lowering disease chances and enhancing overall wellness.

Possibly Creating More Peak Performance Times

Adopting 25-hour days might allow us to experience more “biological prime time” episodes daily. These peak windows could improve focus, energy, and productivity. Aligning with lunar cycles and our natural rhythm might boost circadian alignment and long-term health.

Lighting Up the Nations

Several mystical clues intertwine biological dimensions with the concept of the “End of Days” (בְּאַֽחֲרִ֥ית הַיָּמִֽים), as mentioned in Bereshit 49:1 and the Torah portion Balak (Bamidbar 22:2 – 25:9). One significant clue is that the 25th word in the Torah is “light” (א֑וֹר; Or), which symbolically ties into festivals of light like Khanukkah and Christmas, both celebrated globally on the 25th of their respective months, Kislev and December.

The Secret of Unity and Light

One of the mystical clues is the supernal ‘secret of unity or unison’ (Sod Ha-Yikhud; סוֹד הַיִּחוּד), which symbolizes the supernatural state of union or oneness anticipated during messianic times, where ‘negative traits are expected to vanish’. Through the lens of chronobiology, this concept is associated with the number 25, paralleling the function of our suprachiasmatic nucleus (SCN) which regulates our response to light.