A Light in the distance

A few weeks ago, we were driving to my in-law's late at night. Along the way, we pass many farms. It was around midnight & all of the famrs we passed were lit up like everyone was wide awake. I don't know if it was because it was a certain time of the year for harvesting or something. I generally thought farmers typically got up at the crack of dawn (or right before) but not in the middle of the night. Very curious I say.