HI,
YES, I get the sleep paralysis about once a month. For me it's very scary, I do get buzzing sounds, and I can't move and I know I'm screaming for someone to help me get out of it and no one can hear me, even when they are right next to me. Suddenly.. I snap out of it too.
I have been to a few other sites that talk about it.. you might get more help about it here:
http://www.astralpulse.com/forums/index.php
Aras

 It seems like sleep paralysis happens when a person is focusing inbetween or strongly on both physical and etheric energies at the same time.  

 The why probably depends.  I have limited experience with this, only 1 experience i can recollect wherein i thought i fully woke up in the middle of the night to some noise and the thought that someone was breaking into my place.  

  I kind of switched between more purely physical and etheric state, and ended up inbetween or focused on both, and experienced total paralysis as a very tall and somewhat unusual looking Being entered my room and walked towards me (i assume it was an E.T.).  

 I really freaked out at that point, and at first thought the Being was somehow doing this to me, and everything seemed so real and physical, like no other dream, even lucid, ever has.  I concentrated as hard as i could on moving my hand, and did a little though still in that odd inbetween state.  

 Later on, i realized that the Being hadn't done this to me, but that for whatever reason i was temporarily stuck inbetween physical and etheric state (the latter corresponding to the experience of "classic OOBE's).  

 I wouldn't worry too much about this, and Spooky's recommendation from anothers experience probably would help.  My hunch is that the more balanced one becomes between the physical, the mental, and spiritual levels one becomes, the less these kind of experiences will occur.   Also its a matter of not wanting, and not fearing these experiences.

I have had countless episodes of sleep paralysis.  Robert Bruce is an expert in this field, and his explanation of what occurs seems to be spot on based on my personal experience.  

During the onset of sleep, the physical body goes into standby mode as the etheric body, our main energy body from which our finer energy body doubles emerge, expands and releases itself into all levels of our Earth energy system as reflections of its own consciousness in energy bodies of higher and higher vibration.  

This etheric body is attached to the physical body at the core, however, for it is the source of the physical bodies life, its tie to the life-giving energies of our consciousness.  So this energy body remains with the physical body, while the higher energy bodies, being reflections of the etheric body's consciousness, shift into their resonating levels.  

During OBEs, our consciousness makes the transition into one of the etheric body's projected doubles.  However, sometimes our consciousness remains behind as these energy body reflections project into higher levels.  Being that our main energy body is intertwined with our physical body, it cannot move without the action of the physical body, and so we are left in a paralyzed state.  

The level one's consciousness can project to depends on its highest speed of vibration, and so usually when one's vibrations are low, the projection will not occur, but rather you will find yourself stuck in your base energy body.  Likewise, the higher your vibrations are, the higher a level you will be able to project to.

Usually I feel a split second of paralysis before a projection occurs, but sometimes it lasts for several moments.  I have likewise seen aliens and other beings in this state.

Hi angie Iwould say the buzzing noise could have been down to vibration as this blue light is healing being delivered from the spirit of someone who was very close to you, who has passed on and the buzzing could have been from the spirit who was in your room.

The reason your body froze is because your brain is not used to seeing things like this,i have had sleep paralyse myself,never be afraid of receiving this healing light from a loved one who has passed on because they only come in love.

love and God bless  love juditha