I believe you are describing Being breaking through self/ego awareness. Bravo for noticing! And your writing becomes wonderfully lyrical in the descriptions of the timelessness of "those" moments.

Some of what you describe seems like dissociation - that used to be called "spacing-out" - often an automatic response in mundane life. But sometimes its an involuntary protective response to mild and certainly major trauma. I wouldn't call that entering the timeless realm, necessarily. Nevertheless your reflection upon dissociative states is interesting.