I can attest to similar feelings during multiple middle of the night false alarms with dog barking and kids crying. I've followed online support articles includ

I can attest to similar feelings during multiple middle of the night false alarms with dog barking and kids crying. I've followed online support articles including regular dusting and all units are hard wired. I've spoken with support on multiple occasions and exchanged 3 of 5 units with Nest. The units have improved over time with software updates, but continue to be problematic. During one recent false alarm we were not home and the neighbors called the fire department who had to break in to verify there was no fire and disable the alarm. I contacted Nest support after that incident and they were unable to determine the cause of the alarm. We never had a false alarm with the previous dumb detectors.