Yep, it's old advice – change your smoke alarm batteries twice a year when you adjust your clocks for Standard and Daylight Saving Time.
But here's a new twist: The National Fire Protection Association now says in addition to putting traditional smoke detectors "near" sleeping areas, you also should put one "in" each bedroom. Why? Many older homes often have just one alarm per level, and that may not be enough to protect people who sleep with their bedroom doors closed.
Another "who knew?" fact about traditional smoke detectors: They're generally good for only 10 years. So if you live in a home built before 2005 and you haven't replaced the smoke detectors since moving in, chances are, it's time for a trip to the hardware store. Pick up one for each level of your home (including the basement) plus one for each bedroom.