Moonlight and Sleep: The Science Behind the Myth

The full moon has long been blamed for keeping people awake and even causing madness. But is there any truth to this belief? Research shows that the moon can indeed affect sleep, but its impact on mental health is less clear.

Sleep Disruption

Studies have found that people sleep less and take longer to fall asleep during the days leading up to a full moon. This is likely because the bright moonlight delays the body's internal clock and reduces melatonin, the hormone that helps us feel sleepy. The effect is stronger in places without artificial light, like rural areas or while camping.

Mental Health and the Full Moon

But does this sleep disruption lead to mental health problems? While sleep loss can worsen conditions like depression, bipolar disorder, and schizophrenia, the evidence that the full moon directly triggers psychiatric crises is weak. Some studies have found small effects, but these are not consistent worldwide and may be influenced by cultural factors.

Other Theories

Other theories about the moon's effects, such as gravitational pulls or geomagnetic changes, do not hold up under scrutiny. The most plausible explanation for the "full moon effect" is simply the disruption of sleep caused by moonlight.

Why the Belief Persists

So why do so many people believe in the full moon's power? Psychologists suggest that we tend to notice and remember the unusual nights that coincide with a full moon, while forgetting the many nights when nothing happens. The moon is also highly visible, making it an easy target to blame for our sleeplessness.

Modern Lighting

In our modern world, artificial light has a much bigger impact on sleep than the moon ever will. That is why many sleep experts argue for permanent standard time, which better matches our biological rhythms.

Conclusion

If you find yourself restless on a full moon night, it may not be your imagination. But if sleeplessness happens often, look closer to home. It is likely a culprit of the light in your hand rather than the one in the sky.