Star Trek episode? Woman being seduced by green mist?

This scene from a scifi TV show (pretty sure it was Star Trek) has stuck with me for ages. I was just a kid when I saw it so context and other details are unclear. I would say I saw it around the mid to late nineties. But from what I recall there was a woman in a recliner sleeping/relaxing and a green haze starts hovering/talking to her. Ring a bell anyone?