This article originally appeared in the West Australia:

A village in Kazakhstan is being evacuated as scientists grapple with the cause of a mysterious sleeping sickness.

Dozens of people in the remote Kalachi village have fallen victim to the affliction, with many passing out in schools, at home and even one on a motorbike.

Some victims have remained unconscious for days and some have also suffered hallucinations, headaches and fatigue.

The Astana Times reports the country’s Deputy Prime Minister said a combination of carbon monoxide and outer hydrocarbon gases from a nearby uranium mine was the cause.

Read the full story at the West Australian.