Tokyo People seem to be sleep deprived. Anytime of the day it is possible to see someone sleeping on the trains.
These “rules” are from my observations.
If someone is light or older it is ok if they lean against you.
If they have bad breath are heavy or Snore you may give them a small poke to wake them… so they will not lean on you.
If you sleep until the end of the line the conductors will not wake you… Unless it is last train.
You should always try to sleep sitting up straight, with your head down ( so you don’t snore or look like a baby bird expecting a worm.)
You should try to wake up before your station so you do not have to rush out of the train.
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