Section II
Literature Review
The scientific literature on lunar influences in humans is fragmented, controversial, and often minimized — not because the evidence is absent, but because the dominant chronobiological paradigm is overwhelmingly solar. Yet when examined carefully, a more complicated story emerges.
Key Studies
🔬
Cajochen et al. (2013)
−20 min sleep, −30% deep sleep, lower melatonin at full moon in controlled lab — participants had no visual access to the moon
🌍
de la Iglesia et al. (2021)
Lunar sleep modulation is "ancestral" — persists across 3 Indigenous communities in Argentina, including those without electricity
🧠
Wehr (2018)
Some individuals with bipolar disorder exhibit circalunar mood cycling, with depressive and hypomanic phases aligning with lunar illumination patterns
🌊
Casiraghi et al. (2021)
Human sleep synchronized with the moon cycle under natural conditions — evidence of non-photic lunar entrainment
Proposed Entrainment Mechanisms
Light-mediated
Gravitational
Electromagnetic
Evolutionary
Methodological Biases Against Lunar Research
—Solar centrism in chronobiology — the 24h rhythm dominates all framing
—Population averages erase high-amplitude individual responders
—Neurodivergent populations systematically excluded from studies
—Artificial lab environments suppress natural environmental cues
—Western science dismisses lunar knowledge as superstition
"The literature does not prove the Luna Cycler. But it does something more important: it makes the Luna Cycler plausible."