Why is it people feel weird during full moons ?

Why is it people feel stranger/weirder/hornier/ during a full moon? And why did the name “Luna-tic” come from luna? And the myth that werewolves come out during only a full moon?

Does it have to do something with us being water and the moon’s gravitational pull?

Or is this mass hysteria ?

Has anyone ever felt…. “off” during a full moon?