Is it normal to fantasize before bed?

Most nights before bed, I enter a little dreamworld. It's like a movie, I'm the star. I'm everything I ever wanted to be, or whatever takes my fancy at the time. There is only one constant. Mr. Perfect. He is the man of my dreams, literally, and he gives me everything I need. If I've had a crappy day in reality, mr fantasy is there to cuddle me or make me a cup of tea (sometimes it's boring, sometimes he has superpowers). He's not there every night, but most of the time. I don't like daydreaming about real people because in your dreams you're in control, and if I daydream about someone behaving in a way they don't in real life, it could cause upset because my unrealistic expectations are not being met.
I understand that I'm using this as a vice for whatever is lacking in my life (which seems like everything at the moment). I generally have trouble sleeping, falling and staying there, so this just soothes me I guess.
I have stopped this once before, I can't remember why, and when I'm in a relationship it's toned down a LOT, more focused on my career and fake friends. It's like a whole little world. Like the Sims, in my brain!!
So my question is, is this behaviour detrimental to my mental health? More importantly, is there anyone else out there that does this? Sometimes I also pretend I'm on a talkshow and just talking about random things (makes me feel special).