Four in the morning, snow still coming down, and the only lights moving in Yarmouth are the amber ones on top of a plow truck. Starrett Snow and Landscape Services runs those hours — driveways opened, walkways cleared to the door, sand and salt laid where the grade turns treacherous. Storms here rarely arrive politely; they come off the water wet and heavy, or they come dry and blow back in behind you an hour later. The measure of a night is simple: someone steps outside at seven and the way to the car is already clear. That is a thing worth getting up for.