I tried meditating as usual, and I noticed that the opening of the Sahasrara chakra at the crown of my head was clearly better than a few days ago.
This was the day after I felt that the energy route from the center of my head to my right ear had been strengthened. Suddenly, I realized that the crown of my head felt different, and it was more open than before. Yesterday, I felt that the area around my right ear had the biggest change, but this morning, I feel that not only that, but the energy route extending upwards from the crown has also opened up considerably. Considering that it was just yesterday, there seems to be a certain connection.
This is a matter of degree, so if I were to describe it in words, it had been open before, but the difference is that it feels empty.
Previously, the crown of my head felt like there was a wall between the skull and the area above it. Gradually, that wall has been disappearing and changing to an empty feeling, but there was still a wall. Today, the boundary with the skull is almost gone, and I feel that energy is flowing directly upwards.
Compared to a few years ago, when the Sahasrara chakra was open with a gap of about a needle or a finger, this is a world of difference. Although I say it has opened, it still feels like it will probably be further strengthened. For now, I think it has become a state where the entire Sahasrara chakra at the crown feels empty and open.
Even in this state, only the crown of my head is open. For example, the energy route on the left side of my head is not yet as well-formed as the right side, and there is still stiffness remaining in the area towards the third eye between the eyebrows. There is still a slight sensation of touching sand with my hand, like a gritty feeling, in a place slightly inside from the crown.
However, it is clear that if I continue diligently, I can gradually open up, starting from the center of my head to the right ear, and then the crown. Therefore, I will focus on meditating on the areas that are still stiff.
In this state, it feels like the energy that can be used by the body is being strengthened. For example, regarding the recent challenge of strengthening the energy route on the left side of my head, I feel that I can now activate it much more powerfully with the power of my will than a few days ago.
In the book "Mikkyo Yoga" by Professor Honsan, it is written that after the Sahasrara chakra opens, the other chakras are further strengthened. I think that might be what is happening.