Whenever I visit Japan, I always wake up very early in the morning. This is because of my routeen to wake up early in the morning in Hawaii.
So no matter how late I go to sleep, my routeen is trying to wake me up according to the Hawaii time. This is how I can visit many places and do holoholo from eary morning during my staying in Japan.
However, I am not a superman, of course. I am always sleepy during day time and I sometims enjoy moimoi while moving by bus or train.
By the way, the formula or equatation to find out Japan time is easy.
Hawaii Time + 5 hours (+1 day)=Japan time.
5:00 a.m. in Hawaii is 12:00 midnight in Japan.
6:00 a.m. in Hawaii is 1:00 a.m. in Japan.
7:00 a.m. in Hawaii is 2:00 a.m. in Japan.
8:00 a.m. in Hawaii is 3:00 a.m. in Japan.