Wisdom Teachings - Sat Yoga, Costa Rica

Student Question: Sometimes when I meditate I start to feel a very blissful state, but after some time the opposite happens and it becomes almost unbearable and even painful. When this happens I usually stop but today I continued and as I did I thought of the word dematerialization. So I was wondering if that state is associated to “moving from the particle to the wave” that you were referring to and if it is at all related to transmutation as well, is there a connection? What is it that happens?