Four lights, one approached me, then retreated to group, merged and then flew away.It was roughly 4 am, I had been awake for around 2 hours. I was in my kitchen looking out at the backyard, when I noticed 3 white lights. I thought they were drops of rain on the window iluminated by the kitchen light, but as I looked closer, I could see that they stayed in the same position as I walked around the kitchen. All of a sudden, another one emerged from behind the ground elevation (the objects were approximately 150 metres away), they then begun to interact. One seemed to fly right through the other, then as I went out onto the blacony to get a better look, one approached in my direction. I was in the house within seconds, as I peered out of the window, it continued its approach, when the 3 behind it lit up brightly for about a second, the object immediately flew back to the group. Then they hovered there for a few minutes when they apparently merged together, it then changed its shape to an oval, the furthest points of the oval were pointing horizontally, it then began to shrink then expand and finally began to fly upwards, until it was out of sight, I could still see the glare through the clouds until it disappeared.The lights when I first saw them appeared to be diamonds (my vision could have been blurred) but seemed to round themselves out.