A multiple sleep latency test (MSLT) is an objective way to measure sleep quality. It helps diagnose narcolepsy and insomnia.

In my twenties, I saw my episodes as a (mostly) harmless quirk, akin to sleep walking. They didn’t always keep me in my family’s good graces, but I felt otherwise fine. I brushed them off for years.

Zara Lachlan survived near-misses, injury and sleep deprivation to become youngest person, and first woman, to complete ...