I currently work in a physics research laboratory which is literally deep underground. I sometimes start work in the morning (like normal people), sometimes in the afternoon, and sometimes at midnight. That, combined with being underground contributes to not always being sure of what day it is.
My past work experience has been in satellite technology, military radar, and surveillance technology. There was also some work with plasma generators and statistics.
My travels for work and pleasure have taken me to other countries and to places in the USA that are off the tourist path, broadening my world view considerably and giving me a better understanding of cultures, and some perspective on my own culture.
All of these have provided seeds for stories and for characters. The various things I've experienced in my travels, work, and hobbies gives me a reference for what is possible.