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Do You Sleep a lot? You Might Have A Higher Risk of Stroke
Older adults who said they slept more than eight hours were 46 percent more likely to suffer strokes in the next decade than adults who slept for six to eight hours, according to an analysis published Wednesday in the journal Neurology.
Even worse, the stroke risk for people who went from sleeping less than six hours to sleeping more than eight hours was nearly four times greater than for people who consistently got six to eight hours of ZZZZs.
Even worse, the stroke risk for people who went from sleeping less than six hours to sleeping more than eight hours was nearly four times greater than for people who consistently got six to eight hours of ZZZZs.
So researchers from the University of Cambridge and the University of Warwick in England looked for answers in a cancer study. They used data on 9,692 people from Norfolk, England, who participated in the European Prospective Investigation of Cancer. All of them were between the ages of 40 and 79 when they enrolled in the study in the 1990s, and they were tracked for an average of 9.5 years.
Short sleep was associated with an 18% increased stroke risk (not statistically significant), and long sleep was associated with a 46% increase in stroke risk after adjustment for conventional cardiovascular disease risk factors and comorbidities.
In addition, those who reported persistently long sleep had double the stroke risk compared with those with persistently average sleep duration, and people whose sleep duration increased markedly over the course of a 4-year period had almost a fourfold increased risk.
People deemed “short” sleepers (those who slept for less than six hours at night) also seemed to be more susceptible to a stroke. Their risk was 18 percent greater than for average sleepers, but the difference was small enough that it could have been due to chance.
Upon closer inspection, the researchers noticed some intriguing patterns. The relationship between sleep duration and stroke risk was somewhat stronger for women than for men. It was also stronger for strokes that were fatal, according to the study.
When the study participants were examined according to age, the researchers found that sleeping for more than eight hours a night increased stroke risk only for people who were at least 63 years old. On the flip side, they found that sleeping for less than six hours a night heightened stroke risk for
Finally, they discovered that “short” sleepers were more at risk for an ischemic stroke (the kind caused by a clot that blocks blood flow to the brain) while “long” sleepers were more at risk for a hemorrhagic stroke (the kind caused by a ruptured blood vessel bleeds into the brain).
The research team also conducted a meta-analysis that combined their results with those of 11 previously published studies. Altogether, the analysis included nearly 560,000 people from seven countries who suffered a total of more than 8,000 strokes.
In the meta-analysis, “short” sleep was associated with a 15 percent increased risk of stroke and “long” sleep was linked with a 45 percent greater risk. Those results validated their findings, the researchers wrote.
Still unclear is whether sleeping too much or too little can actually cause a stroke, or whether the biological processes that lead to a stroke also happen to influence sleep. Other studies have linked long sleep times to cardiac problems like atrial fibrillation, atherosclerosis and other conditions that may make a stroke more likely. But scientists will have to conduct experiments to get a better idea of how sleep and strokes are related, the study authors wrote.
“Long potent
The study was published online February 25 in Neurology.
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