In the tenth episode of Superquark, Ushuaia Nature travels to the gigantic and fascinating universe of caves and abysses, to this world that hosts - both literally and figuratively - real precious stones. Nicolas Hulot and his team will cross Mexico, Panama, the Dominican Republic, to finally land on the lost island of Malpelo, in the country of Eldorado, to meet the creatures of the ocean darkness. At the Laboratory of Psychophysiology of Sleep at Sapienza University, they are studying how to cure insomnia through neurostimulation. According to researchers, by applying electrodes to specific areas of the skull and conveying a very light and imperceptible electric current, with an inhibitory or excitatory action on the brain circuits, it is possible to modulate the ability to fall asleep. Fall asleep with a click, in the report by Marco Visalberghi and Barbara Bernardini.