Hello Mrsfoo11!
It's good to hear that you are using your Tinnitus condition to your advantage. It can be very very useful if you decide to pursue WILD as your main induction technique.
That "wave" of euphoric feeling is also a common thing I hear about people who get to SP. I myself have experienced this said "wave", and it is indeed a glorious feeling! From what I've read, that is most probably just the transition of your body from waking to sleeping, and you notice it because your mind is awake and aware.
As for the noise while you are in SP, it is only normal. They are most probably auditory hallucinations. I often get these too, in fact, when I am in SP, most of my hallucinations are auditory. Sometimes a voice would whisper in my ear, and sometimes I would hear noises as if I were in a crowded restaurant.
I am not sure what you mean about the activation of the pineal gland, as I have not read up on it yet. I did find this article in my search, you can check it out if you want.
http://www.dreamviews.com/f77/pineal-gland-130521/
Best of luck to you, and happy dreaming
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