Between 2013 and 2016, a baffling phenomenon struck the remote village of Kalachi in northern Kazakhstan, where dozens of residents began falling into sudden, prolonged sleep-sometimes while walking, driving, or even mid-conversation. The symptoms mimicked drunkenness at first-slurred speech, dizziness, and loss of balance-before victims succumbed to sleep that could last for days, with no memory upon waking. Investigations revealed no contamination, radiation, or consistent medical cause, and while isolated cases dated back to 2011, the full-scale waves of the "sleeping sickness" led to partial evacuations before the condition mysteriously disappeared in 2016 as suddenly as it had emerged.
Several theories have attempted to explain the outbreak. The official government stance blamed carbon monoxide from nearby abandoned Soviet uranium mines, though this failed to align with the absence of carbon monoxide in medical tests. Another theory proposed chemical leakage into the village's water supply, but no evidence of water contamination or toxic waste was found. The most psychological explanation suggests mass psychogenic illness (mass hysteria), triggered by shared anxiety and stress, though that too lacks definitive proof. To this day, no single explanation can fully account for the strange wave of sleep that swept through Kalachi.
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