Quaking in anticipation

I thought something happened last night! Remember waking up to a shaking room, dazedly concluding someone was under my bed shaking it, and drifted back off to sleep.

(It's perhaps a measure of how thrashed I was that I didn't consider the fact of someone being under my bed to be worth further exploration.)

Sheesh, a 5.3 earthquake in the UK after 25 years. Just what's happening under the Earth's crust these days?