I have experienced this quite a few times especially. I slept,
and fell "asleep". Later on I came back to consciousness, I know
I'm not dreaming, but I couldn't move at all. It became frustrating
as time passes, you really want to "get control of your body", but
you simply can't. In times like this, I would chant... and usually
after chanting I can wake up very fast. But before chanting, I've
already waited for don't know how long... I even had the experience
of feeling like floating out of the body, while being aware of it
(not dreaming), in sleep.
I think this is quite a common problem and many people would share
the same experience. If you experience this again, try to remember
not to panick, as this period of time will eventually pass. Try to
stay calm and focus on the mind chanting. As for that you have
heard voices, maybe some people really walked pass you and talked
to each other. I'm not sure. Or you're still in a
semi-consciousness state and memories get replayed in your mind
although you still have certain level of conscioussness.
I don't think you have to see a doctor. Next time you sleep, sleep
facing right side, and remember - don't put something on top of
your body while you sleep. I've read that it can cause such
problems in sleep...
