This is probably the time most traders are looking at the charts too and placing their trades.
Your broker should indicate when stuff opens and when stuff closes, I think a lot of large capital moving into trades (cfd or physicals) are probably not ones who change their mind about something or do things differently because another market is closed (eg liquidity and slippage will still likely be the same).
Well this becomes even complex when you shift the timeline to asia/pacific and break the day and night barrier. I mean when market is trading in the India, NSE and BSE opens and closes based on the previous days world news! This always helps us give some heads up for the market prediction.
I mean not entirely perfect but you get little idea what can happen next day. Since asian country like India is over-powered by the US and European countries so the effect is seen from them to us.
Well, companies like 63 moons and ticker are the biggest one in India to control the data transfer on the live feed even when the world's clock are different.