Why is willy home? Why is Linda alarmed that hes home?

Act I/ Scene I

The salesman, Willy Loman, enters his home. He appears very tired and confused. Linda Loman, his wife, puts on a robe and slippers and goes downstairs. She has been asleep. Linda is mostly jovial, but represses objections to her husband. Her struggle is to support him while still trying to guide him. She worries that he smashed the car, but he says that nothing happened. He claims that he's tired to death and couldn't make it through the rest of his trip. He got only as far as Yonkers, and doesn't remember the details of the trip. He tells Linda that he kept swerving onto the shoulder of the road, but Linda thinks that it must be faulty steering in the car.