22 February 2012 Updated at 13:07 ET
Sudden cardiac death: Time of day link found in mice
James Gallagher
Health and science reporter, BBC News
The body goes through a 24-hour rhythm
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How the time of day can increase the risk of dying from an irregular heartbeat has been identified by researchers.
link-
http://www.bbc.co.uk/news/health-17127649