This is a demonic espisode that has been experienced by many people around the world. The voices are coming from disembodied spirits that bring an opressive force/presence. Often people will report that they cannot speak, move, or touch the person next to them, if there in bed with some one else.
What I've taught my children over the years is to call on the Name of Jesus. Even if it isn't audible to you, because you are in a spiritual battle the angels of the Lord will come to your rescue.
Know that the spirit of the Lord will encamp around about those who love Him!
Live Well, Live Blessed!