Can being on call overnight up your risk of death?

Study suggests less than six hours of sleep a night increases mortality from MI, stroke and heart failure

Sleep-deprived doctors are at higher risk of death from cardiovascular disease if they get less than six hours of kip a night, new US research reveals.

Sleepy doctor

The study looked at data on the sleep habits and CVD parameters of more than 14,000 people, comparing deaths from stroke, MI and heart failure, as well as cardiovascular risk factors.

It shows there is a sweet spot for sleep and cardiovascular health that seems to be between six and seven hours. 

Any less, or more, increases the