I've had a few experiences with sleep paralysis in the past, and although it felt unreal at the time, I figured it must real (as in, I am actually thrashing around in bed, just seeing hallucinations), because it seemed to fit with what I read online, and I had no way of proving that it wasn't real.

However, this morning, I "awoke" in bed and did a reality check, causing me to become lucid. I was excited to get up and start doing fun things, but I found I was paralyzed, and could barely move. I did however manage to kick myself out of bed onto the floor. But then after a few seconds, I woke up for real, still in bed under the covers.

So, it is possible I dreamed the whole thing? Can you become paralyzed in your dream?