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The Moon and the human body: what science actually backs

The relationship between the Moon and the human body is a topic full of overstatement on both sides. There's plenty of mystical belief without a base, and there's dogmatic skepticism that ignores real data. The honest picture:

What has consistent evidence

Sleep is affected by the full moon. A controlled lab study (Cajochen et al., 2013, Current Biology) showed a 30% reduction in delta waves (deep sleep) and about 20 minutes less total sleep near the full moon, even in light-free environments. The effect has been replicated in other studies. Magnitude varies between individuals.

Human activity changes near the full moon. Analyses of hospitals and institutions show small variations in admissions and behavior. The effect is small (a few percent) but statistically detectable.

Tides affect marine and coastal life. That's basic physics. Fishermen and divers plan around the lunar calendar for good reasons.

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