Help. I don't know what to do.

So I've been openly gay for a little under 4 years now, but I've known for basically my whole life. Everyone's been really supportive for me for as long as I can remember. However, just recently I had a dream where I was with one of my best friends who is a girl, we hit it off and had sex (all in the dream of course). Is this normal for everyone? Or is my mind tricking me psychologically? Or do I have a bit of straightness in me? Please help.