You’ll sleep tight come Sunday as daylight savings time ends and we all gain an extra hour — especially if you check your smoke and carbon monoxide (CO) alarms and change the batteries.

That’s the advice from the state Fire Marshal’s office.

“Working smoke and CO alarms are crucial home safety tools,” said State Fire Marshal Jon M. Davine. “As we ‘fall back’ this weekend, be sure you have the best protection by putting fresh alkaline batteries in alarms that use them and replacing alarms that are out of date.”

Hyannis Fire Chief Peter J. Burke, Jr, president of the Fire Chiefs Association of Massachusetts, stressed the alarms save lives.

“Carbon monoxide is the leading cause of poisoning deaths in the United States, and heating equipment is the main source of carbon monoxide in the home,” Chief Burke said. “We can’t see, smell, or taste carbon monoxide. Working CO alarms are the only way to detect this invisible killer.”

Smoke alarms should be replaced when they’re 10 years old, and CO alarms should be replaced when they’re five to seven years old, depending on the model.

Remember to test your smoke and CO alarms once a month to be sure they’re working properly.