How much sleep do we really need? Australians are sleeping less than they used to. But how much do we really need? And what's the impact on life and work when we're sleep deprived? One recent NSW study showed that almost 1 in 5 working adults are chronically sleep deprived. And apart from feeling sleepy and grumpy the next day, these people are running a bigger risk of developing cardiovascular disease and diabetes. With a third of our workforce now working between the hours of 7pm and 7am, it's now emerging that night shift workers are putting themselves at risk of developing similar health problems to those who are sleep deprived. The Danish Government has recently compensated 39 nurses and flight attendants who developed breast cancer after careers of working night shifts. They are currently the only government in the world who have formally recognised a link between working night shift and the onset of cancer. Up to 1.2 million Australians suffer from a range of sleep disorders from insomnia to sleep apnoea. Join Insight and a cast of insomniacs, shift workers, teenagers, emergency workers, new mums and sleep scientists for a fascinating discussion on Sleep. You can talk to our guests Ron Grunstein, Russell Foster and Chris Seton after the show on our Live Chat. You can also follow Insight on Twitter. Find out more about sleep disorders with these information sheets prepared by the Australasian Sleep Association on behalf of Sleep Disorders Australia, a support group for sleep disorder sufferers and their families.