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According to Dr Lekhansh Shukla, assistant professor at the National Institute of Mental Health and Neuro Sciences in Bengaluru, India, tapentadol "gives the effects of an opioid" including very deep sleep.

"It tends to be a silent infection, but it can develop into neuro syphilis and cause cardiac problems."

This new Stanford study, part of Wu Tsai Neuro's NeuroChoice Initiative, provides the first direct experimental test of these competing hypotheses.

"We have treated injuries on various parts of his body," Thapa told BBC News Nepali, "He is under observation in the neuro surgery ward."

Neuro- and marine biologist Anders Garm from the University of Copenhagen's Department of Biology couldn't ignore the question.