Earthquakes are weird - depending on where you are in relationship to the quake, you might not feel it, but people further away were really affected. If you go to the US Geological link - it shows where it was felt the most.
Then again, I've lived in California for 10 years now, and slept through my first 3 quakes (all under 5 points). So, it's easy to sleep through them too, especially if you have a bedmate who tends to be restless so you're used to a little shaking at night. :+