Falling asleep between 10:00 p.m. and 11:00 p.m. is associated with a lower risk of heart disease than falling asleep earlier or later, according to a new study European Heart Journal – Digital Health.
Why it matters: While scientists have investigated the relationship between sleep time and cardiovascular disease, the relationship between sleep time and heart disease is still largely inadequate.
How they did it: British researchers tracked nearly 90,000 people between their early 40s and early 70s for sleep time, lifestyle habits and physical performance – and tracked them for episodes of cardiovascular disease over an average of six years.
What they found: Compared to falling asleep between 10 p.m. and 11 p.m., there was a 25% higher risk of cardiovascular disease with falling asleep at midnight or later, a 12% higher risk for 11 p.m. to midnight, and a 24% higher risk To fall asleep at 10 p.m.
What they said: The results “suggest that going to bed early or late is more likely to disrupt the internal clock, with negative consequences for cardiovascular health,” said study author David Plans of the University of Exeter.
- “The riskiest time was after midnight, possibly because it reduces the chance of seeing the morning light, which resets the internal clock.”
Yes but: The important thing is not when you go to bed, but that your habits are consistent, said Stanley Wang, medical director of the Center for Sleep Disorders at the Heart Hospital of Austin, the American-Statesman.
- He suggested that the relationship between sleep time and illness has less to do with time of falling asleep than it is with the health habits of people who go to sleep at that time.
Remarkable: Wang told the statesman that it is stressful for the body to leave this biological rhythm – which is why there is an increase in heart attacks and car wrecks during the switch to summer time.