For me I have travelled many time in sleep-trains in the post soviet countries. Provided you are in 2nd class or higher, the sleep is generally comfortable and

For me I have travelled many time in sleep-trains in the post soviet countries. Provided you are in 2nd class or higher, the sleep is generally comfortable and lulling. But I might be used to it, as we also did often when I was a child and I was used to rocking and train noises.