When you are trying to get somewhere in your dream you somehow end up back where you started.
Strange sites may be seen, such as the floor slowly rotating.
A dreadful sound is continually in the ears.
A huge weighty being which causes incredible pain renders you paralized; it may seem to be seated on your back as you dream you are laying in bed in agony. There is no way to get it off you.
You cannot call out; you lose your voice entirely.
You are in terror as it seems to be stealing the life out of you;
you know that if you stop struggling against it for a second you will surely perish. This is the worst of its horrors.