Gald you are checking with the FD. Sometimes mice can cause problems with chewing on wires or if there is a dead mouse in a heater duct or behind a wall, they can also stink extremely bad. If a mouse chews on wires it can cause a short in the wires and can smolder.
You are not getting any fumes from the nearby fires from other states are you?
Be sure you have new batteries in any smoke dectors. Please keep us posted. Our thoughts and prayers are with you.