Which of the sentences is true according to the text?
But as many as 60 per cent of us do not think we are sleeping enough, with a third suffering from sleeplessness.
Trying to push too much into one day by going to bed early and getting up late could lead to serious illnesses in life
Researchers found that those who slept for less than six hours were almost 50 per cent more likely to suffer strokes and 15 per cent more at risk of a heart attack.
Those who have too much sleep aren't likely to suffer a heart attack.