Trading activity before market open?

Hi,

Newbie with a dumb question here…

It is currently 3:00PM EST on a Sunday and I’m starting to see sporadic trading activity on the EUR/USD (3 candles so far on the m1 chart). I thought the markets open at 5:00PM EST? What could be causing this “premarket” activity? I’m using Trading Station on FXCM.

Thanks.