Do you always feel driveless, unfocused and tired? You were sleeping for six hours? But that's just not enough for your body. Researchers at Harvard, Philadelphia and Pennsylvania Universities have recently investigated how the number of hours of sleep per night affects humans. They came to the frightening conclusion that in some respects it makes little difference whether you have slept for six hours or not at all.

Greatly reduced comprehension

For this study, the sleep behavior of 48 adults over two weeks was observed. Those who got away with six hours of sleep did just as well – or badly – in test questions after just ten days as those who had not slept for two whole nights. People who sleep less than five hours a night have an even greater attention deficit and should not drive or use heavy machinery.