WEDNESDAY, Dec. 11, 2019 (HealthDay News) — The risks for incident stroke are increased with long sleep duration, long midday napping, and poor sleep quality, according to a study published online Dec. 11 in Neurology.

Lue Zhou, M.D., from the Hubei University of Medicine in Shiyan, China, and colleagues examined the associations between sleep duration, midday napping, and sleep quality and the risk for incident stroke among 31,750 participants aged 61.7 years on average at baseline.

The researchers found that those reporting longer sleep duration (at least nine hours/night) had a greater risk for total stroke compared with sleeping seven to less than eight hours/night (hazard ratio, 1.23), while no significant effect on stroke risk was seen for shorter sleep (less than six hours/night). For midday napping of more than 90 minutes versus one to 30 minutes, the risk for total stroke was increased (hazard ratio, 1.25). For ischemic stroke, the results were similar. The risks for total, ischemic, and hemorrhagic stroke was 29, 28, and 56 percent higher, respectively, for those with poor sleep quality versus those with good sleep quality. Significant joint effects were seen on the risk for total stroke for sleeping at least nine hours/night and midday napping of more than 90 minutes (hazard ratio, 1.85) and for sleeping nine or more hours/night and poor sleep quality (hazard ratio, 1.82).

“These results highlight the importance of moderate napping and sleeping duration and maintaining good sleep quality, especially in middle-age and older adults,” a coauthor said in a statement.

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