Lately, I have been much more efficient in my morning routines. Basically, I still do all the same things before leaving to work. But for example today I was already ready to go almost half an hour earlier than I used to be. Enough to catch the previous train.
Basically, this means I could start sleeping a bit longer. In practice is probably wake up at the old time anyway so maybe it's better to just start taking the earlier train. I would be a bit earlier at work and in turn able to leave work earlier as well. It would also give me a bit of leeway to still catch the later train if I would spend a bit longer getting ready for some reason.
On the other hand, I prefer the later train. It's usually not that crowded. It's nicer to have a bit more room sitting on the train. Maybe I'll just keep waking up at the same time and see how the morning goes. I can always pick the suitable parting time day by day depending on how the morning goes. It doesn't matter that much what time i'd be at the office. There usually isn't any meetings before nine anyway.