What could be dangerous with sleeping on a train? I always sleep on trains and buses, I even change when I go to sleep, so I'm tired when on the train, so I can fall asleep.

M5x7wI3CmbEem10, I first thought you were worried about sleeping too long, getting off at the wrong station

I suppose it's getting robbed? And that you live in a quite different part of the world than me :-/