(Koreans sleeping on the subway.)
Back in 2004-2005 when I was living in Korea commuting to work on the subway for about an hour everyday, I used to get some really good sleep.
Well, how do you get some good sleep in the Korean subway without forgetting to get off at your destination station?
What I used to do was set timer on my cellphone so I would wake up 1-2 stations before my destination station.
Of course, this would only work if you know how long it takes to get to your destination but most likely you would if you commute everyday.
Also, don’t fall sleep all the way that you are totally unconscious as there are people who will rob you while you sleep. 🙂