Looking for an explanation for recurring nightmares of leaving the house without your trousers on or losing your teeth? New research suggests you can blame the Earth's magnetic field, rather than a repressed childhood.
Darren Lipnicki, a psychologist formerly at the Center for Space Medicine in Berlin, Germany, found a correlation between the bizarreness of his dreams, recorded over eight years, and extremes in local geomagnetic activity.
Other studies have tied low geomagnetic activity to increases in the production of the melatonin, a potent hormone that helps set the body's circadian clock. So, based on anecdotal evidence that melatonin supplements used as a sleeping aid can cause off-kilter dreams, Lipnicki wondered whether local magnetic fields could induce the same effects.
Bizarreness barometer
Between 1990 and 1997, he kept meticulous records of his nightly reveries, amassing a total 2387 written accounts during his teenage years. "I always wanted to do science with them," he says.
For the study, he devised a five-point scoring system to rate the bizarreness of these dreams. On the low end are dreams completely representative of reality – "I am sitting at a table doing some maths or physics homework," for instance.
Dreams that scored a three could happen, but seemed unlikely. For example: "A friend is in the backyard of my house, building a wooden platform atop of 7-foot high stilts."
The most bizarre dreams that Lipnicki recorded had little or no connection with reality: "I was stranded on a foreign coastline with a monkey that spoke English and a woman that suddenly became small, almost doll-sized. Then I was at home."
Dream result
Lipnicki looked up daily geomagnetic activity in Perth, Australia – his home at the time. A scale called the k-index quantifies local geomagnetic activity, and he included only days that scored on the extremes of this index. This whittled his dream log down to 66 days of low geomagnetic activity and 70 days of high activity.
Using these figures, Lipnicki uncovered a statistical correlation between dream bizarreness and geomagnetic activity, with freakier dreams occurring on days with the least geomagnetic activity.
Of course, this correlation doesn't prove that the Earth's magnetic activity determines whether we dream of a mundane day at the park or something more like an LSD trip. But a larger and better controlled study may be worth pursuing, Lipnicki says. "At this stage, it's just putting the idea out there."