We jumped out of bed to investigate and both felt the floor shaking quite violently beneath us. Izzy realised then what it was, and said 'get into the doorframe' - which I did, and when the movement had subsided a little, we ran to the back of the house (which is built into a hill), where there is a door to the patio, and nothing much above or below our heads.
It didn't last all that long - probably 40 seconds or so - but it was really scary. All I could think about was whether another part of the country was being completely devastated, and whether there would be aftershocks in the night. It made me realise how powerful the earth is too, and how we should really be more prepared for having to survive if a big one hit. We're going to start putting together an emergency pack.
It turned out that it was a magnitude 7.0 quake - a real whopper (the devastating Feb 2011 Christchurth earthquake was 6.3), but the epicentre was 230 km underground and 60 km out to sea, so no damage was done thankfully. This picture from the Geonet site shows how far across the country it was felt..