For a period of time, healthy young men in Southeast Asian communities were dying suddenly in their sleep. Witnesses described choking, gasping, panic, and signs of distress in the night. In some cases, those deaths seemed to overlap with something else people across the world have reported for centuries: sleep paralysis.

In this episode of The Midnight Drive, we look at Sudden Unexplained Nocturnal Death Syndrome, also known as SUNDS, through both its history and the medical understanding that emerged later. This is not presented as an unsolved mystery. It is a story about a disturbing pattern, the fear surrounding it, and what researchers now understand about hidden cardiac rhythm disorders, sleep states, and the cultural meanings people attach to terrifying nighttime experiences.

This episode also explores why sleep paralysis feels ...