This definitely seems like the more likely explanation. There certainly is a mental/emotional hell you go through in academia, but with this y-axis being specifically about psychiatric medication… all I’m seeing is that grad students like/need Adderall.
In order for the tides to rise significantly in the Baltic or Mediterranean, you’d need that much extra water to flow through the narrow opening in the straits of Gibraltar/Denmark.
The Baltic sea also probably is less affected because it’s so far north, and the tides are based on the Moon’s (not-quite-equatorial, but not THAT inclined) orbit.