It's time to Spring Forward this weekend and Greater Danbury area fire officials are reminding residents to change the batteries in smoke detectors as you change your clocks.  Carbon Monoxide alarms should also be tested and the batteries changed.  Smoke and CO detectors should be replaced every ten years.  According to the National Fire protection Association three out of every five fire deaths occur in homes without working smoke detectors.  The organization says ensuring that smoke and carbon Monoxide detectors are working cuts your risk of fire death in half.