Tokyo is a sleepy town. Everyone is always asleep. Cafes are full of table sleepers, parks with bench sleepers and especially the train. I've seen a whole carriage asleep. I’ve seen a man who has bound his hands up in the hanging handle thing and fallen asleep hanging from it. I also saw a young lad fall asleep while playing his game toy thing, then waking up for two seconds, playing a bit more and nodding off again. Then, yesterday, there was a man who fell asleep in the middle of texting.

Also you have to be aware of sprawlers who might be sitting next to you and fall into your lap with maximum embarrassment for them. Even worse is a standing sprawl, falling off the handles straight into a seated person. H said she saw this. I almost did it the other day. My MO is foolproof, though. I sling my head back and rest it on the window. There's no chance of sprawling but I do worry about snoring.