Twice in my life I've had what I'd consider a lucid dream.
In both situations I felt asleep on a particular sofa in my home for some quick shut eye. In both cases I then had some strange mangled distant seeming dreams and then went into a more stable dream in which I was doing everyday things, but had complete control over the situation. Strangely enough I recognised that I was dreaming right away. I've never worked ever much on training myself to realize I'm asleep, but in these dreams (although they were relatively normal) I knew it instantly.

I've come to the conclusion that my experiences have more to do with taking a nap over the area, as I've tried sleeping at night on the sofa as well.

I'm wondering if anyone else has experience this, or if there is a good reason why I can lucid dream so easily taking a nap and not when I actually sleep.