They calculated each person’s Sleep Regularity Index (SRI) score, with higher scores denoting more regular sleepers. The team then tracked incidents of cardiovascular death, heart attack, heart failure and stroke over eight years and found that irregular sleepers were 26% more likely to suffer one of these events than those with a regular sleep cycle. Irregular sleep means the variations in the time someone goes to sleep and wakes up. However, it was an observational study and, as such, can only establish a link rather than cause and effect: we can’t know for sure if irregular sleep patterns caused the increased risk. But even those irregular sleepers who got the recommended amount of sleep had a higher risk of suffering a major cardiovascular event.

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Persons: Jean Pierre Chaput, ”, “, Chaput, Naveed Sattar, Attar Organizations: CNN, University of Ottawa, World Health Organization, University of Glasgow, Epidemiology & Community Health Locations: Canada, Scotland