Poor sleep linked to surging cancer rates in under-50s

Two large studies have linked poor sleep to rising cancer diagnoses among adults under 50, adding a concrete potential cause to one of medicine's more alarming trends. Early-onset cancer cases worldwide nearly doubled between 1990 and 2019, climbing from 1.82 million to 3.26 million. The findings arrive as researchers scramble to explain why younger generations are getting cancer at rates their parents didn't.