Last week I returned to my Adam in the rain and dark after a long day in work to find that one of the daytime running LED lights was fully lit up (just the drivers side...) no idea why and it hasn't done it since. Is Adam playing with my mind???
Could be your parking lights. If you click the indicator stalk up or down (left of right) after you take the key out one light stays on as a way of your car being seen on a very dark road. I haven't tried it in my Adam but definitely did this in my Corsa (although then it was my side lights that stayed on)