The South Dakota fire marshal is recommending you check your smoke detectors before setting your clocks back one hour when you go to bed Saturday night.
When you press the smoke alarm's test button, the detector should make a sound. If it doesn't, the batteries need to be changed. If that doesn't work, it's time to replace the detector.
Also, brush-up on your family's exit plan in case of a fire emergency. If you don't have an escape plan, this is the perfect time to come up with one.