During meditation, my breathing spontaneously stops, and Kevala Kumbhaka has reappeared.

Thinking back, this happened quite a while ago, around February 2018. However, after the awakening of Ida and Pingala (Kundalini) in November of the same year, I actually became less skilled at breath retention, and it hadn't happened since then. But recently, unexpectedly, during meditation, it's happening again like before, where my breathing stops for a while, although it's only about 30 seconds or so. After exhaling, I don't automatically inhale, and my breathing stops in the exhaled state. After a while, I don't feel anything for a short time, but after a while, I gradually start to feel uncomfortable, so I consciously inhale. In this state, I have to consciously and explicitly inhale, otherwise, only the exhale happens.

This doesn't happen in my daily life, and it doesn't happen every time I meditate; it happens occasionally.

As a meditation state, this is actually quite good. My mind is stable, and distractions are generally absent, and even if they do arise, they don't usually disrupt the meditation. My aura extends from the lower part of my body to the Sahasrara. I can maintain a good meditation state. However, only my breathing stops, and even though I am conscious, after a while, I judge that "this is not good for my body," so I consciously inhale.

After inhaling and taking a few conscious breaths with a consistent rhythm to properly fill my lungs, when I resume meditation, the exhale tends to dominate again, and the inhale doesn't move automatically. Again, my breathing stops in the exhaled state.

This type of Kevala Kumbhaka is said to occur during meditation in yoga, and it is described in the Hatha Yoga Pradipika, the Shiva Samhita (3.47), the Gheranda Samhita (5.89-96), or the Yoga Sutra (2.50).

These descriptions all state that Samadhi or the achievement of Raja Yoga is attained after the natural cessation of breathing due to Kevala Kumbhaka. In reality, since this Kevala Kumbhaka occurred before my initial Kundalini experience, it could indeed be seen as a sign of achievement. However, I think that this Kevala Kumbhaka is probably not a sign of achievement, but rather a sign that "it's time to move on to the next stage."

As the descriptions indicate, they all share the commonality of achieving a balance in internal energy.

Indeed, just before Kundalini awakens for the first time and before the dominance of Manipura, the energy is relatively stable, and while it is still limited, it can be said to be in a certain state of equilibrium. Even in that stage, where Kundalini itself is not yet awakened, and even Ida and Pingala are not functioning properly, it can still be said to be a relatively stable state. When that state is reached, a state of "calm" or a "plateau" where growth seems to have temporarily stopped, the energy becomes stable, and that is why Kevala Kumbhaka might occur.

As for my current state, it is relatively stable, but it has not yet opened up to Sahasrara, and even so, it can be said to be in a certain state of equilibrium. My meditation is stable, and I feel energetically fulfilled, with no excess or deficiency, and I don't think there are any particular problems. However, I still feel that there is a wall above. This state is similar to the period before the awakening of Kundalini (mainly Ida and Pingala).

This state of energy equilibrium is probably not permanent, but rather a plateau, and it may be a stable state before leaping to the next stage.

However, this is just a speculation, so I will continue to meditate and observe.