I don't know why people jump to the conclusion that it is not nibbana. Not trying to start an argument; just saying that it's possible that it is a glimpse of nibbana.
Let me try to conciliate what venerable Pesala is saying with what other teachers teach. Ayya Khema taught that there were path moments and fruition moments. The path moments, she says, are like what venerable Pesala is describing: a cessation of perception and feeling. Acording to Bhante Gunaratana, a path moment occurs when you destroy a first fetter of the next level. It could be the fetter of belief in a self; or it could be doubt in the case of stream entry being your next level. It could also be sense desire in the case of once returning; and so on. Acording to Ayya Khema there is also a fruition moment: when you destroy all the fetters of the respective level of awakening. That fruition experience, she says, can be repeatedly experienced if the meditator
wishes to. It would seem to me that what you are experiencing might be spontaneous fruition moments. It could be possible that you are a stream enterer and were reborn in this world already as a stream enterer.
Now, since you are also scientificaly inclined, I trust that you are mature enough not to be fooled by wishful thinking. Analyse what your experience is and, even if you reach an absolute certain conclusion, continue striving to the end of suffering.
A delicate problem here is that if it is true that you were a stream enterer when you were born, the criteria that the Buddha laid down for determining if a person is a stream enterer might not be a good way to judge that. If I recall correctly, the criteria are: no belief in a self; no attachment to rituals; and no doubt about the dhamma. This last criterion is difficult to evaluate in your hypothetical situation because if that's the case, then you didn't experience a before-doubt period and an after-doubt period.
Anyway I have no idea if it's a fruition moment or not. But, nevertheless, it's worth exploring that possibility. I mean, if there is a place on the internet where that kind of person would ask a question like that, it would be right here on dhamma wheel.
PS: I hope I'm not misrepresenting the teachings of the above teachers.
He turns his mind away from those phenomena, and having done so, inclines his mind to the property of deathlessness: 'This is peace, this is exquisite — the resolution of all fabrications; the relinquishment of all acquisitions; the ending of craving; dispassion; cessation; Unbinding.'
(Jhana Sutta - Thanissaro Bhikkhu translation)