You know you're a writer when ...

Does that ever happen to you, too? That you think up a situation or indulge in some fantasy or other and the whole thing gets played out in sentences written in your mind and not in a movie-like sequence of pictures?
It happens to me all the time. Especially during the minutes before falling asleep - which is also a time when I get ideas for new stories or think up a scene of a story I'm currently working on.