Global Forex Trading

Global Forex trading is actually a quite accurate description of how the Forex market works.
The global Forex market opens on Monday morning (local time) in Auckland/New-Zealand and closes Friday afternoon (local time) New York/USA.
Within this five day interval, positions can be opened and closed at any moment.
If you're experienced with futures and/or options, how would you define overnight positions with Forex? There aren't any, the closest equivalent being positions held over the weekend.