I can't imagine having to deal with the shinkansen! That I probably wouldn't have gotten used to. But a train every 20 minutes or so was easy enough to become accustomed to.

Since I dont have much sleep time these days, when I do, I sleep deep. I'm sure you could compose a full orchestra next to me and I wouldn't wake up, lol. Maybe if I had been awake, I would have found it scary, but by the time I woke up when my roomie came, I was still pretty much in a daze. It didn't go one for more than a couple minutes after I woke up. Then I checked FB, checked my phone, turned the news on, then went back to sleep.