Not that you would understand this, but two different vibrational rates between the two realities.

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Why Frequencies are the Key to Understanding Parallel Universes and Time Travel
Brendan Murphy • Sep 05, 2015
Frequencies
The eminent physicist and co-founder of string theory, Michio Kaku , has said:

“If you have a radio in your living room…and you have all frequencies in your living room; BBC, Radio Moscow, ABC, but your radio is tuned to one frequency—you’re decohered from all the other frequencies. You’re only coherent [wave phase and amplitude in alignment; either exactly or in whole number ratios] with one frequency. We now believe that the universe is vibrating and that there are vibrations of other universes right in this room. There are the universes of dinosaurs because the comet didn’t hit 65 million years ago; the wave function of aliens from outer space looking at the rubble of an earth that already was destroyed—all in your living room, except we have decohered from them. We’re no longer in tune with them, we don’t vibrate with them…Probably there are other parallel universes in your living room and believe it or not this is called modern physics…get used to it. This is the modern interpretation of the quantum theory, that many worlds represents reality.”

Not long ago, almost anyone who uttered such a sentiment would have been dismissed by many as “New Age-y,” “flaky,” and so on, but it is no longer feasible to use such convenient rationalizations with physicists of Kaku’s credibility speaking as a clairvoyant or mystic might. In fact, identical sentiments have been put forth by theosophists a century and more ago in describing the astral plane, which interpenetrates the physical plane without either realm’s inhabitants being aware of the other, “whose senses are normally capable of responding to the undulations