I rode in a sleeper car in December 1999 in Australia, between Melbourne and Sydney, and it was an unpleasant experience. It was a jerky, bumpy, noisy ride, somebody kept going between the cars for smoke breaks and the smell wafted into our cabin, and there was a baby crying in the cabin next door.

I think this is a personal thing. Even at home we are not equal. I can sleep almost anywhere, and usually fall asleep in a very short time after lying down and closing my eyes. Some people can even fall asleep on a chair in a wedding party with loud mudic and bright lights without even being wasted. Some people can't. Some will always complain about the bed, even in the most luxury/premium hotel. My partner can't stand the slightest light going through blinds, a neighbor making noise or the drunktards making noise in the street at night. Yet she will fall asleep in a matter of minutes in a car.

So as an individual traveling alone, you know your limits and can pretty much figure out if that way of travelling works for you. For a family, you are pretty sure at least one member of the family will have a rough night and complain in the morning.

A sure way to spend good night while travelling is to be very active during the day. You sleep much better if you have walked for 15 to 20km around a city to visit it than if you have been idle most of the time and taken taxis and buses whenever you could. Most lazy people don't understand that rest has to be earned.

I often have trouble first night on a trip even when jet lag isn't involved although that, of course, makes things worse. Then I usually get into a rhythm.

And, yes, especially when time zones are involved, sticking to a schedule and getting exercise helps.