We all obsess over 8 hours. But a massive new study suggests we are asking the wrong question. It's not just how long you sleep. It's how regularly you sleep. A study tracking over 60,000 adults in the UK Biobank found that sleep regularity was a stronger predictor of early death than sleep duration. Same total hours. Very different risk. What Did The Study Do? Researchers led by Windred et al. (published in SLEEP, 2024) analyzed data from 60,977 adults who wore activity trac