"Everyone experiences hallucinations," Anil Seth, a neuroscientist at the University of Sussex in the UK, said.

I recently noticed my colleague’s change in behaviour over the past year. For the last nine years that I have known her, she was a happy and well-adjusted person whom the other team members looked up to as ‘big sister’.

About a quarter of the population of a northern Kazakhstan village has sporadically and suddenly falling into a deep sleep, and no one can explain why