Full Moon Insomnia: Does The Moon Affect Your Sleep?

full moonCan you remember how well you slept the last time there was a full moon?

Do you, or someone you know, feel that when the moon shines brightest, things just don’t seem right?

If so, you’re not alone. Despite a lack of scientific evidence, millions of people believe that the moon holds an uncanny power over them.

In this article, I’ll be looking at why people feel the moon has such an influence over them, as well as studies that have been done into this worldwide belief.

Then you can make your own decision as to whether or not you think you’ll sleep differently when the next full moon comes around.

Not just superstitious people

Even casual exposure to the emergency services, law enforcement, teaching or social care will involve contact with firm believers in the adverse effects of a full moon.

From hospitals to police stations, the full moon will be blamed for everything from poor sleep patterns to an increase in accident numbers to sudden psychotic episodes.

Serious, professional, highly trained individuals are certain the moon affects us. In 2011, the World Journal of Surgery stated that more than 40% of medical staff believed lunar phases impacted on human behavior. However, a thorough statistical analysis didn’t back this up.

The constantly changing moon is the largest and most obvious thing in our night sky and the full moon begs to be noticed.

So perhaps it’s unsurprising that it’s been linked in the media to a rise in burglaries, changes in voting patterns, volatile stock market prices, more road accidents, less successful surgeries and the numbers of children born.

There’s no scientific proof to back up any of these claims, yet still people believe.

The Transylvania effect

The Transylvania Effect is a term first coined in academic literature in the 1990s. It describes the belief that the lunar cycle can produce both psychologically and physiologically disturbances in people and populations.

The belief that the moon exerts a direct influence on the body and mind can be traced back to pre-Christian times. Pliny the Elder, Roman author, naturalist, and philosopher believed that because the full moon caused heavy dew it must also make the brain become “unnaturally moist”.

That was how, he claimed, the moon caused both epilepsy and lunacy. Hippocrates noted that “no physician should be entrusted with the treatment of disease who was ignorant of the science of astronomy”.

And the word lunatic, across various languages has its root in the moon – the old English word for lunatic was monseoc, which literally means moon-sick.

In the 21st century we perpetuate lunar myths in our entertainment and our media. From books to films, from memes to light-hearted end of the world news stories, we constantly repeat the tropes of the Moon’s effect on behavior.

With the constant media repetition of an association between the full moon and human behaviour it is not surprising that such beliefs are widespread in the general public (Kelly et al. 1996)

Ancient Calendars

earliest lunar calenderThe very earliest calendars were based on the cycles of the moon, with the sighting of the new moon indicating a new phase in the year.

Marks on the walls of the prehistoric painted caves at Lascaux in France are believed by Dr Michael Rappenglueck, of the University of Munich, to be the earliest known calendar.

The series of dots and squares painted among the 15,000 year old drawings of bulls, horses and antelopes represent the 29 day lunar cycle.

Most pre-modern calendars were lunisolar, combining the solar year with the lunar year. The Julian calendar abandoned this in favor of a purely solar reckoning. However, the Islamic calendar opted for a purely lunar one.

It should be noted that lunar calendars have always been particularly popular among agricultural societies; this may well be the foundation for our belief that we sleep less during the full moon.

All full moons rise around the time of sunset. But the so called “harvest moon” and “hunter’s moon”, which occur during the agriculturally busy late summer and autumn in the northern hemisphere behave in a notable way.

They move across the sky in a way that means there’s no long period of darkness between sunset and moon rise for several days around the full moon.

So our belief in restless sleep on full moon nights may stem from a long held belief that we should be out working under the full moon.

Anecdotal versus strictly scientific

Anecdotal evidence for a lunar effect isn’t hard to find; it’s not uncommon to find people who swear they sleep poorly over the nights of the full moon. And moon madness stories from the front line of those who see humanity at its worst are surprisingly common.

We may publicly dismiss them, but privately we consider them because one captivating anecdote will always stick in the mind better than a host of scientific studies.

In nature, we can prove lunar rhythms – for example, the triggering of the spawning of the coral on the Great Barrier Reef around the full moon in December. But with regard to humans, to date, no scientific study that indicates a lunar influence on behavior has stood up under scrutiny.

The closest a study came to actual evidence was a July 2013 project carried out at the University of Basel in Switzerland. The study suggested a correlation between the full moon and human sleep quality.

Under highly controlled conditions, in a circadian laboratory, a small sample of 33 healthy adults were recorded as having four minutes less REM sleep over the nights of the full moon.

Unfortunately, the results of the experiment have never been replicated, and the statistically small size of the sample casts doubt on the validity of the results.

Founded on misconceptions

red full moonThe belief that the moon can influence the human body is founded on misconceptions then, it seems.

Some suggest that because the moon has a profound effect on the tides then it must also have an effect on humans who are mainly water.

In actual fact, the moon exerts a very weak tidal force on uncontained water. Astronomer George O. Abell claims that a mosquito would exert more gravitational pull on your arm than the moon would on your body.

Yet despite the lack of scientific proof weary staff will often arrive at work blaming the moon for their poor sleep and their children’s difficult behavior.

What research does demonstrate, however, is that many people fall prey to a phenomenon that University of Wisconsin–Madison psychologists Loren and Jean Chapman termed “illusory correlation”.

That is, the perception of an association that doesn’t in fact exist. For example, many people who have joint pain insist that their pain increases during rainy weather, although research shows this to be untrue.


There’s no established scientific link between the full moon and sleep patterns or aberrant behaviors of any kind.

Maybe there was once, when the world was darker and the bright moonlight made us restless or drove us to work late into the night. But it’s something we left behind when we lit our streets and set about controlling our environment.

Or it could be that a firm belief in the influence of the moon is a psychological hangover from the days when something as magnificent and otherworldly as the full moon in the sky just had to mean something!

On November 14, 2016, the moon was closer to Earth than it had been since January 26, 1948. It was both a full moon and a supermoon and the next time it will be that close to the earth is November 25, 2034.

Therefore, the full moon of last November was the closest and largest supermoon in 86 years. The term supermoon is relatively new, coined by an astrologer in the 1970s. The media picked up on it in 2011 because it’s a lot more catchy than the term perigean full moon that the astronomers used.

There were a lot of rising headlines written about that supermoon, helpful articles on what to expect, whether to be worried and how to explain poor sleep.

And so the myth lived on.

Your thoughts

Do you feel that the moon influences how well you sleep? Does the full moon appear to affect your or someone you know’s behavior? Let me know in the comments below!

46 CommentsLeave a comment

  • I’m a Namibian, at first I thought it’s only my brother and me struggling with this lunatic thing, but thanks to God there’s an internet where we can learn and share… I love and hate full moon..

  • Literally tossed and turned for over two hours last night even after taking melatonin and another natural vitamin to help sleep.
    Same for tonight. Sleep mask on and even though I laid down in bed feeling I was about to sleep well and way easier than last night… NOPE. Been in bed for an hour and a half and WAS NOT on phone until I literally decided to look up this topic bc it’s making me feel crazy… Or should I say… Like a lunatic!

  • Sept 5,2017. I’ve always had trouble with sleep during a full moon. I have a twin brother call me one day and ask. Don’t think I’m crazy but when there’s a full moon. I didn’t let him finish. I said you can’t sleep. I said omg should have known because we are twins. It is so hard to get back to a routine if sleeping after a full moon. Sometimes it will drive me almost crazy.

  • I never even knew something like this existed until recently , I always thought it was something to do with my periods . But it’s 4 am now and I still haven’t gotten any sleep and it’s full moon today . It is a possibility now that I think of it . And I have had such a long long day, it’s in a way shocking I still haven’t slept . I first thought maybe it’s cos am over tired . Maybe it’s all of it . I don’t know . But am so tired and I want to sleep and am not able to . Maybe I should just give up trying and watch something and just let it go . My room is pitch black so there is no way it’s the moon light entering but yes it’s a full moon night and it looks beautiful outside. Am glad to know am not alone anyway. Sending love and Power to you all.

  • Every full moon for about 3 nights running I wake about 3am then toss and turn till 5. 30 ish … light sleeper at the best of times but when it’s full moon I’m wired my daughter is the same …

  • Leave a comment:

    Only enter your email if you'd like to follow this conversation. Your email will not be published. Feel free to comment without entering your email or name.

    Thank you for your comment. I will read and publish it as soon as possible.