I used to take one in France, but I could not sleep well (like when taking an overnight flight) and arrived tired. It was a alternative to spending 5.5 hours in the train during the day, or flying. (then this service stopped)
One thing that is missing is the possibility to take a shower before leaving. I don't think there is any public shower in train stations in France any more. Same problem with night coaches: after having walked in a city the whole day, I don't want to make the experience bad for the other travellers.
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