If you used to sleeping in a very quiet room, I suggest getting some Loop Earplugs or similar. The background noise should be much less than a plane, and the a

If you used to sleeping in a very quiet room, I suggest getting some Loop Earplugs or similar. The background noise should be much less than a plane, and the air pressure etc is obviously normal, but the erratic noise can be more -- e.g. some clunks if the train stops.