It happened to me twice recently. It's the detection of 'phantom' smells. I smelled dead fish in the car while DH was filling the gas tank. It only lasted about 30 seconds, but boy did look around for a dead fish! Another time I had just turned out the light to go to sleep and I detected like burning metal...whatever that is. Again lasting 15-20 seconds. Not happened again for about 2 weeks. I Googled it and sometimes nose surgery is needed. Anyone else? Salena