Spike in visitors - NOT amateur radio

Periodically, I wake up to see that visits to this blog have shot up. Today was a point in case: looking at the blog quite early I see the visits today are already higher than the whole of yesterday. When this happens I can usually see where these come from. Often it is hackers in Eastern Europe, but there is no evidence of this on this occasion. Maybe I have a sudden interest in what I write. Somehow I doubt this!