Damned if you do and damned if you don't alert!
The Toronto Star alarms with Amount of sleep linked to heart disease:

CHICAGO - Too little sleep - or too much - may raise the risk of developing heart disease, according to a study of nearly 72,000 nurses.

Women who averaged five hours or less of sleep a night were 39 per cent more likely to develop heart disease than women who got eight hours. Those sleeping six hours a night had an 18 per cent higher risk of developing blocked arteries than the eight-hour sleepers.

And nine or more hours of shut-eye was associated with a 37 per cent higher risk of heart disease. Researchers could not explain that finding, but suggested those women might have slept more because of underlying illnesses.

Repeat after me, kids. Correlation is not causation.