This has happened to me on occasions as well. I believe it's called sleep paralysis. It doesn't occur very often, so I haven't studied or sought out treatment.

It's very unnerving to wake up and not be able to move or speak. Sometimes it makes me scared and sometimes I realize the problem and simply close my eyes and try to go back to sleep.

Some people actually have hallucinations. Imagine being in this state and seeing horrible images all around you. This probably comes from dreaming. A lot of people believe that those who claim to be abducted by aliens are actually going through this kind of sleep paralysis. I've only had one occasions where I continued to dream as I woke up. I had been dreaming about bees and when I woke up I could not move or speak and I could feel a bunch of bees crawling all over my hand. All I wanted to do was get up and shake them off, but I couldn't.

This happened to me today for the first time. I was sleeping and got a phonecall and i answered it, i had complete control over all motor functions but i couldn't speak. The person on the other end of the phone was talking but i couldn't reply...very scary!