Your own Existential experience is only one, your ātman, self. Everything else is your perceptional experience. If you remember in the dream, is this perceptional reality or existential reality?, you will wake up. In the waking state, if you remember, is this perceptional reality or existential reality?, you will be awakened.

Kenopanishad. The sacred secrets revealed in the Kenopanishad.  The 3rd and 4th mantra in the second khanḍaḥ of Kenopanishad.

yasyāmataṁ tasya mataṁ  mataṁ yasya na veda saḥ
avijñātam vijānatāṁ vijñātmavijānatām || 3||

The 4th verse recite along with Me:

pratibodhaviditaṁ matamamṛtatvaṁ hi vindate
ātmanā vindate vīryaṁ  vidyayā vindate ‘mṛtam || 4 ||

I’ll read out the translation for the 3rd and 4th verse, then reveal the sacred secrets.

He by whom, It is not known, to him It is known and experienced; he by whom, it is Known, to him, It is not known or perceived. It is unknown to those, who think they know It well and known to those, who know It not.

The 4th Verse:

It is truly known, when the Self is consciously cognized and subjectively known to oneself in each state of Consciousness with every modification of the mind and intellect. Through such complete, matured cognition of the Pure Self is attained immortality, amṛtatvam —existence in one’s own Self. By Ātman, the Pure Self is attained real strength, the space of powerfulness. And by Vidyā, Complete Knowledge of the Self is experienced Immortality, which is the true nature of Ātman.

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