Entrainment - What does it feel like?

I usually lie down in a quiet room with subdued lighting with my eyes closed and play a cassettes on a walkman with headphones (not speakers). The volume should be adjusted so that the sound is clearly audible, but not so loud that it become the focus of your attention simply because of its volume.
    The effect I notice most often is that of finding my mind wandering and realising that I've forgotten about the tones or noise in the earphones. When the mind is wandering the thoughts can go in really odd directions reviving childhood scenes or memories that haven't been thought about for decades.
    There have been times when I can feel the sounds "pulling" my mind in a particular direction. A particularly unusual feeling is that of having one's mind pulled in two different directions simultaneously by two different sets of tones - and having the effect last after the tape has ended.
    Other times, there has been the feeling of being on the edge of a (mental) abyss and having to pull back to stop myself from being pulled into it.
    One of the most fascinating times was an occasion when I felt like, all of a sudden, I could see into eternity. It was a conscious feeling like having a veil removed from my sight - an inexplainable feeling but really amazing. I know this sounds presumptuous - especially to say that I could see forever when I've got my eyes closed and it's all happening inside my head! However, that's what it felt like and I can't explain it any other way.
    The effects are unpredictable, and depend on how busy my mind is, whether I'm worried or preoccupied and how willing I am to just let go. On many occasions, I've found myself thinking "I'm not going to be able to lock on today" and I realise that the entrainment signals are in the last stages of a tape where they're pulling me back to consciousness - much like dreaming you're dreaming, just before you wake up. Just when I think the tape isn't working, I've found that most of half an hour has passed without me realising it.
    As I said above, the results are varied, sometimes exciting and generally very relaxing. If you like exploring your mind, this is a great way to go!