Interactive Market Course.
When the Sydney stock exchange starts working at the beginning of the week, there is still early morning in Tokyo, a Sunday evening in London, and a Sunday afternoon in New York.
At the very start, all assets quotes show a reaction to the events that occurred over the weekend. The behavior of prices at this time is very difficult to predict, and therefore it is strongly not recommended to leave open positions over Saturday and Sunday. Better close them on Friday evening if you do not want to experience unpredictable Stop Out.