The Danbury Fire Marshal’s office is reminding residents to replace the batteries in your smoke detectors and carbon monoxide alarms this weekend. Sunday is when we turn the clocks back an hour for daylight saving time. The Fire Marshal's Office says the number one cause of smoke detectors failing to alert occupants in a fire is dead or removed batteries. They are also launching another safety campaign, urging people to “Close your door when you snore”. Keeping the bedroom door closed will help slow the spread of smoke and fire and possibly give more time to get out of the house.