Warwick scientists say lack of sleep 'bad for health' (UK)

"The risk of developing heart disease can increase by as much as 48% if a person does not get enough sleep, University of Warwick scientists say. A long period of sleep shortage increases the risk of heart attacks and strokes, according to scientists. They found most people need between six and eight hours of sleep a night to protect their health. Professor Cappuccio and co-author Dr Michelle Miller, from the University of Warwick, conducted the research. They said they followed up evidence from periods of seven to 25 years from more than 470,000 participants from eight countries including Japan, the USA, Sweden and the UK"