A common question is to why people see/feel an evil presence when in Sleep Paralysis (The initial stage of a WILD).

My theory is that the reason for this is because of the fear that people are stricken with due to SP. When you enter SP, you can't move a muscle, and that is a scary thought. Also when in sleep paralysis, you are really close to sleeping, so you're mind isn't as likely to say, "don't be affraid, you're just in sleep paralysis".

Think of it this way, you have your (half awake) conscious mind, and your subconsious mind. You're conscious mind deals with paralysis by being affraid (even if you're full awake consious mind is expecting it) and your subconscious mind associates fear with nightmares.

Therefore, my theory is that one is in SP, one becomes fearful, and they fall asleep with fear instilled in them. They have a FA (I believe the transition from SP to a dream can be absolutely instaneous) and in this FA they see a figure, the 'old hag' generated by the fear caused by the SP. They then become more fightened, so much so as they wake themselves up as in a nightmare.

You don't often hear of too many people experienced with WILDs and SP feeling the evil presence. It is more often reported in unexpected SP victims or during the first few times WILDing.