The problems with sleeping cars that I have used, a long time back now, are stuffiness, heating control, having to sleep head to the corridor (noise), and in lower class the difficulty of two persons having to share very limited space. What it must be like in a continental T3 (3 berths) I cannot imagine. Couchette cars are another set of problems as 6 people have to share ! I once travelled in a 1st class German car with an ingenious method of longitudinal berths rather than transverse, unfortunately memory is hazy as to the exact arrangement but it was comfortable.
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