Totally normal

I do too. You just have enough oxygen to allow the breath to slow down, and at one point you feel like you have stopped breathing completely. It might be frightening to experience the first time, but when you are used to it, it is really nice, because by then your whole world is silent, no thoughts, no bodily sensation and no breath.

The only kinds of breaths that are dangerous are breathing shallow breaths quickly (you can faint) or to actually not be breathing at all (holding the breath intentionally).

Other than that it is fine.

Happy breathing!