Recently I had some interesting "Old hag" experiences. Really terrifying ones. Still many people here are talking about hypnogogic SP, which they would like to induce with help of some technique. No matter how I tried, i couldnt achieve really that deep state as I experienced in my "Old hag" episode (hypnopompic one). This leads me to question.

1. What are the differences between hypnogogic and hypnopompic SP experiences?
2. Is it possible to have that Old hag experience on sleep onset?

I am asking this becouse I think it is quite easy to get this kind of (sometimes terrifying) experience when dream ends, but I simply cannot imagine, how waking state of mind could transform into this hallucinating state of mind using any technique.

Thanx for all your responses.