Experts say dangerous sleep apnoea affects an estimated 8 million in the UK alone, and everything from evolution to obesity or even the climate crisis could be to blameWhen Matt Hillier was in his 20s, he went camping with a friend who was a nurse. In the morning she told him she had been shocked by the snoring coming from his tent. “She basically said, ‘For a 25-year-old non-smoker who’s quite skinny, you snore pretty loudly,’” says Hiller, now 32.Perhaps because of the pervasive image of a “typical” sleep apnoea patient – older, and overweight – Hillier didn’t seek help. It wasn’t until he was 30 that he finally went to a doctor after waking up from a particularly big night of snoring with a racing heartbeat. Despite being young, active and a healthy weight, further investigation – including a night recording his snoring – revealed that he had moderate sleep apnoea. His was classed as supine, the most common form of the condition, meaning it happens when he sleeps on his back, and is...