You know you’ve been traveling too much when:
(a) You see that lady in front of you hand the TSA agent a Massachusetts driver’s license, think "What a coincidence that she’s from Massachusetts as well!”, then realize that you’re at Logan airport and not in SFO.
(b) You scan the departures screen for your flight to Chicago, don’t find it listed, then realize you’re in Chicago on your way to Boston.
(c) Your watch and your computer are set to two different time zones. And neither is set to the time zone you’re in.
(d) You start recognizing flight attendants and flight numbers
I’ve been traveling too much, although I haven’t reached (d) yet.