Occasionally I get a word of short phrase stuck in my head in the same way that I might get a song or bit of music. It goes round and round and often it's a word where I don't know what it means.

Today I woke up with the word Lepidopterist in my head. I can't think of why this might be. I was trying to read 'The Blind Watchmaker' (a book about Darwinism by Richard Dawkins) before I went to bed so maybe he mentioned it when I was half asleep and it got stuck between my brain sides?

Anyway, does anyone else ever get this?