Sometimes I have this type of dreams, I remember one dream that I had another family and then woke up, looked at my real mother and then I thought "This isn't my mother...Right? But..." Then I start to feel sad and almost cried because the whole life I had with the mother in my dream was all gone and she didn't exist. I have them sometimes but it's always a different subject(friend, girlfriend, an entire life, dreams, myself). I remember one that I was playing an awesome game, woke up and then headed to my computer to play that game again, then found out it didn't exist.

Do you have this type of dreams? Is this normal? What's your opinion?