more i think about it, it's making more sense US futures open at 1700 CT. night session is actually the start of the daily bar for the next day similar in asia, night session is beginning of new daily bar difference is there is huge break in asia between end of night session and start of day session (6 hours), which makes it seem like it's just an extension of the day session
although, it's still a little confusing . . Monday's daily bar does not begin with a night session while Friday's daily bar ends with the night session included
nope, still wrong . . in fact, friday's night session is the beginning of the following monday's daily bar according to sierra chart and (cqg) qtrader, and even the exchange's own data: https://www.jpx.co.jp/english/markets/statistics-derivatives/daily/index.html
Stop thinking in terms of the time zone where you reside. And start thinking in terms of the time zone of the financial instrument. Then it will make much more sense and is less confusing.