What concrete, measurable factor, distinct from unknown lunar energy, might plausibly cause minor sleep disruption during a full moon?

Increased ambient light interfering with melatonin production

While the physical mechanism involving lunar gravity is rejected, a much simpler, concrete physical factor is recognized as a potential contributor to observed sleep disturbances. The full moon represents the brightest natural source of illumination in the night sky after the sun. This increased ambient light can directly interfere with the body's natural cues for rest by disrupting the production of melatonin, a hormone critical for regulating sleep onset and architecture. Scientific consensus suggests that any actual minor sleep effect observed is more likely attributable to this simple physics of light pollution than to an unknown lunar influence, an effect that could be entirely mitigated by ensuring total darkness in the bedroom.