Thinking I was going to sleep in this morning, our household was woken abruptly from every single fire alarm going off at the same time. We checked every room. No fire. We called a guy out to check for carbon monoxide. He held his wand over the stove and thermostat but no luck. We had nothing but oxygen in the house. They stopped beeping for about thirty seconds and all started again at the same time. We had to flip the breaker to make them stop. We are beginning to think that it's a paranormal thing because we can't find any answers!

A dirty detector can cause nuisance tripping, and this can be any one of the units.

I assume these are both smoke and CO detectors.

You can try vacuuming out each detector.

You may need to get the instructions for the detectors to see if there is an indicator that will tell you exactly which detector tripped the system.