While my girlfriend at that time (now wife) and I was lying on the grass looking at the sky, I noticed a dot of light moving fast from roughly south to north, in the cleat starry sky. I assumed it was a satellite when it suddenly started to fade and disappear, and then a few seconds later, started to brighten up again, all the while it remained in the same trajectory. It did it again after a few seconds for a second time and brighten up again. It then remained bright until it disappeared from my field of view. I have seen many satellites in my life, but never one that fades and then brightens up again, let alone doing it twice. What it was I do not know...