Having trouble sleeping? It might kill you, says a new study from Duke University Medical Center. Poor sleep for women — in this study, "poor sleep" is defined as taking 30+ minutes to fall asleep or waking up frequently in the middle of the night — means a high "cardiac risk profile" researchers said. It sounds like a vicious cycle: "For women, poor sleep is strongly associated with high levels of psychological distress and greater feelings of hostility, depression and anger. They had higher levels of all the biomarkers tests — higher levels of C-reactive protein and interleukin-6, measures of inflammation that have been associated with increased risk of heart disease and higher levels of insulin." You're depressed so you can't sleep, and not sleeping makes you sick, and that sickness probably only makes you more depressed. No wonder Ambien is so popular! [UPI]