We “fall” back this weekend, turning the clocks back one hour before bed on Saturday night.  And city fire officials are sending out a reminder to local residents too.  North Bay Fire and Emergency Services wants residents to remember to “change your clocks — change your batteries”.  They say it’s a good habit to change the batteries in smoke alarms twice a year in the spring and fall and the time change is a great reminder to do so.  Officials say most fatal fires happen at night and working smoke alarms provide an early warning and critical extra seconds to escape — and can increase your chances of surviving a fire by up to 50 percent.  Meantime, they also say it’s a good time to change the batteries in carbon monoxide detectors too.