I have for many years thought that solar activity (which causes space weather and influences the geomagnetic field, for example causing aurora) affects how people behave. Now there is a study that provides some proof:
"
Close your eyes and relax. Daydream about something pleasant. In this state your brain is filled with "alpha waves," a type of electrical brainwave associated with wakeful relaxation.
Now try it during a geomagnetic storm. It may not be so easy. A new study just published in the journal eNeuro by researchers at Caltech offers convincing evidence that changes in Earth's magnetic field can suppress alpha waves in the human brain."
(from spaceweather.com. Original research here:
https://authors.library.caltech.edu/....2019.full.pdf)
I got to the spaceweather.com site daily to check on activity which might affect behavior.