Sudden cardiac death (SCD) is more common during nighttime hours for women than men, according to new research out of Cedars-Sinai Medical Center.

SCD, when a disturbance of someone’s heart rhythm causes their heart to stop beating, often occurs with no warning signs—and a majority of patients don’t survive. The study, published on Jan. 19 in Heart Rhythm, included data from more than 4,000 reported cases of SCD. All data came from the Oregon Sudden Unexpected Death Study.

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