Sex dreams!

So for the past 2 weeks i have been having very realistic sex dreams. They are so intense and they feel so real that when i wake up in the morning i am surprised that it was actually a dream. On a more embarrassing note, i even had one about my coworker who is a woman. I am a straight woman, and i am in a very serious long time relationship so i dont know why i had this dream which i enjoyed lol has this ever happened to anyone!?