Midlife Sleep Irregularity Linked to Higher Risk of Major Cardiac Events (doi.org)

A study of 3,231 people in the Northern Finland Birth Cohort found that irregular sleep timing in midlife—measured from wearable data—was linked to a higher risk of major adverse cardiac events over 10 years. The association appeared mainly among participants who slept fewer hours than the study median (<7 hours 56 minutes), with irregular bedtimes and irregular sleep midpoints roughly doubling the risk. Wake-up time variability was not associated with risk. The findings suggest that consistent sleep schedules could be a potential target for cardiovascular health promotion.