Imagine getting sick and then slipping into a sleep you can’t wake up from, not for days, not for months, sometimes not for years. In the early 1900s, a mysterious “sleeping sickness” known as encephalitis lethargica swept across the world, leaving people frozen between life and death: eyes closed, bodies still, but often aware of everything happening around them.

Doctors watched as some patients never woke up, while others opened their eyes decades later with strange, permanent damage to their brains, turning one baffling illness into one of medicine’s most haunting unsolved stories.

In July 2014, 28‑year‑old German tourist Lars Mittank vanished after a series of strange, paranoid behaviours at a Bulgarian airport, caught on CCTV running into the woods, never to be seen again. He’d left his luggage behind, seemed terrified of people who weren’t there, and was acting like someone who desperately believed he was in danger.

Years later, his disappearance has become one of the internet’s most unsettling mysteries, raising the same chilling question over and over: what was Lars so afraid of, and where did he go?

Imagine waking up convinced you’re dead. Walking Corpse Syndrome, or Cotard’s Syndrome, is a rare condition where people genuinely believe they have no organs, no blood, or no life left inside them. They might insist they’re a walking corpse, deny the need to eat or sleep, and move through the world like a ghost in their own story, physically alive, but utterly certain they no longer exist.