User blog comment:ChishioKunrin/"Why was Neo afraid of Raven?" An explanation./@comment-9464517-20150814121132/@comment-4010415-20150814182324

Maybe she had other business to take care of and couldn't waste time. And we don't know if the dream was Raven entering Yang's dream or Yang having a dream about Raven from thinking about her so much after seeing her.

Seriously, sometimes if you think about something too much before bed, you dream about it. This one time, I had something I didn't want to talk to my friend about, and she kept nagging me to tell her, but I refused. I went to bed shortly after that, and she followed me around through my entire dream, nagging me to tell her. =_= Needless to say, when I woke up, I decided to tell her.

Also, sometimes, when I play a video game too much or watch too much of something before bed, I have a dream about it.