Where is this graph from?
Actually, including moon cycles is a standard feature in nearly every bitcoin charting service... from bitcoinity to clarkmoody. Who needs complex indicators when you've got the tide on your side?
If the moon affects behavior enough to show marketable increases in crime, then why not buying behaviors? (Ever wonder where the word "Lunatic" came from?)
I know my dream intensity increases during full moons and I've seen too many children have trouble sleeping during them, so something does look like it is being affected.
We are not just walking around on a planet, we are a part of it and the Universe we live in. Our habits are influenced by everything,... grasshopper.
(And then there is the Quantum Physics perspective if you prefer.)
