Lunations is built on a convergence of peer-reviewed research across three fields: circalunar biology, the psychology of self-tracking, and space weather physiology.
Lunations isn't astrology in the traditional sense — it's a structured self-observation practice, calibrated to rhythms that science has started to take seriously. The three pillars below are each supported by peer-reviewed literature. We're honest about where the evidence is strong, where it's preliminary, and where the questions remain open.
Multiple controlled studies now show the moon cycle measurably affects human sleep architecture, melatonin levels, and autonomic nervous system rhythms — independent of moonlight.
Decades of research from Pennebaker through current RCTs show that structured daily logging reduces cortisol, improves emotional regulation, and — critically — surfaces patterns the unaided mind misses.
Geomagnetic activity influences the autonomic nervous system, melatonin secretion, and cardiovascular parameters. The Kp index is a real measure of a real environmental variable, not folklore.
For most of history, the claim that the moon affected human behavior was dismissed as superstition. Then in 2013, a study in Current Biology changed the conversation. Working under the strictest controlled conditions — participants in a windowless sleep lab, unaware of the study's lunar focus, with no light cues — researchers found unmistakable synchronization between sleep architecture and moon phase.
The effect wasn't subtle. Around the full moon, deep (NREM) sleep decreased measurably, sleep latency increased, and endogenous melatonin dropped — all under conditions that ruled out moonlight as the cause. Something else, possibly an endogenous circalunar rhythm, appears to be operating.
Lunar rhythms are not as evident as circadian rhythms and are thus not easy to document — but they exist. Their role is mysterious, and there are probably large individual differences that underlie the contradictory evidence — some people may be exquisitely sensitive to moon phase.
Cajochen et al., Current Biology, 2013This is precisely why individual tracking matters. The science suggests the lunar effect is real but highly variable across individuals. The only way to know your personal pattern is to record it over time.
The journaling research is the most robust pillar here. More than 30 years of studies — from Pennebaker's foundational work in the 1980s through recent meta-analyses covering dozens of RCTs — consistently show that structured expressive writing reduces stress hormones, improves mood, and measurably benefits physical health.
But for Lunations, the most relevant finding is simpler: longitudinal self-tracking surfaces patterns that are invisible to introspection alone. You cannot remember accurately how you felt on the Waning Crescent three cycles ago. The data can.
Emotional upheavals touch every part of our lives. Writing helps us focus and organize the experience.
Dr. James Pennebaker, University of Texas — the foundational researcher in expressive writingThe Kp index that Lunations displays isn't decorative. It measures planetary geomagnetic activity — fluctuations in Earth's magnetic field driven by solar wind and coronal mass ejections. A growing body of research links elevated geomagnetic activity to measurable physiological effects in humans.
The proposed mechanism runs through melatonin. Geomagnetic disturbances suppress melatonin secretion and activate the autonomic nervous system — the same pathway through which the moon appears to affect sleep. The effects are most pronounced in sensitive individuals and during severe storms (Kp ≥ 5).
All biological systems on Earth are exposed to an external and internal environment of fluctuating invisible magnetic fields of a wide range of frequencies. These fields can affect virtually every cell and circuit to a greater or lesser degree.
McCraty et al., International Journal of Environmental Research and Public Health, 2017None of this research predicts your experience. The Full Moon sleep study showed an average effect across participants — some individuals showed no effect, some showed strong effects. The geomagnetic studies report population-level associations with large individual variation. The journaling literature is the most consistent, and even there the effect sizes are moderate.
This is exactly the point. You are not the average. Your personal lunar fingerprint can only emerge from your own record. Lunations gives you the tools to track your energy, mood, clarity, and creativity across every phase of every cycle — not to impose a predetermined meaning, but to let your own pattern speak.
After 2–3 cycles, you begin to see it. Which phase is your creative peak. Which phase brings withdrawal. Whether a Kp 4 day actually correlates with your reported restlessness. Whether your energy tracks the waxing arc or runs counter to it. This is personal science.
The field of lunar research is genuinely contested. Several studies have found null effects, and the mechanisms for any lunar influence beyond moonlight remain hypothetical. We don't overstate the evidence. What's clear is that lunar-aware self-tracking is a robust practice — and for many people, aligning a journaling habit to the 29.5-day cycle creates a natural rhythm of reflection that has real, documented benefits regardless of whether the moon itself is causally responsible for what you notice.
The pattern is already there. You just need a mirror.
Open Lunations →