I dare not even think about it. Of course, you have to choose a sleeper. If it's a short trip, it's ok. Anything for more than two hours. Sleeper heel. The hard seat gap is too big. After sitting in a hard seat for more than two hours, you will feel backache and leg cramps. You can lie on the sleeper and feel more comfortable and less painful. So I think you should buy a sleeper, even if it's 200 less. This is my personal experience, so I tell you that the difference is 100 yuan. You buy a sleeper. For the sake of your own health, in order to suffer less, you should do the same.