Hemi-Sync Brain Going Inwards

Last night listening to Wave 1 Intro to F10, during the brain relaxation part the brain would expand and contract until eventually it felt like it was being squeezed inside out which was startling I had to gasp for some air. I was very deeply relaxed yet mind a bit too awake which is actuallly the whole point. Felt like I had gone much deeper in relaxation with Hemi-sync than any other such sessions. Was unable to relax arms, I placed both hands near chest but heaviness made my chest feel crushed in that relaxed state, so placed on side and unfortunately there was still some discomfort.

Listened to same track again this morning, managed to relax but signal to empty bladder interfered.