Waking up confused and not sure where I am?!

Every once in awhile I wake up and it takes me a second to realize where I am. I am not in a panic or anything; it just takes me a bit to realize that it is the morning and that I am in bed. Almost like I thought my dreams were the real thing. It does not take long to remember where I am, but it is like I forgot that I was in bed and sleeping, it also takes a second to realize what I have to do for the day. Sorry it is hard to explain. The kicker is that I do not even remember my dreams. Last night I did get a good deep sleep, so not sure if that is why. This has happened the last day or two, and before that I would say maybe once or twice a month. It does not happen every time I wake up. I do have some issues sleeping, I tend to wake up two or three times a night. I do not stay awake for long (maybe a couple of minutes). Does anyone know what this is or why it is happening? Thank you