With the sleeper, you might be able to stay in bed & keep warm if you had to. I looked up the cost in one of those once & it was outrageous, but I have taken long distance trains & buses back in earlier years & they were OK. This was a long time ago & they should have improved since then, but I guess not.
They are definitely expensive. I will fly home from Chicago. But it’s really nice and relaxing on the train. The dining room is nice and they have the observation decks where you can just sit and watch the scenery as long as you want.