While dreamscape may not appear to be a subject readily aligned with physics, there are commonalities in the nature of our dreams which suggest a plausible theory. When we move into dreamscape, we move into a high-energy event. Whatever the nature of that event, whether it's communicative or observational, there is an impact which can sometimes be so forceful as to jolt us back into the waking state. Some say that the astral body moves out of the physical body when we sleep, and that this 'jolt' effect is a sudden realignment of the two forms. Whether we can assume existence of an astral body or not, there is something going on in dreamscape which begs interesting questions.
The Multiverse stretches with potential infinity across all possible options of state in which we exist. Without going into detail here about how that infinite series of options might affect the way we live in conscious mode, it certainly seems to lend itself to the possibility that we have access to that multiple-choice framework when we are asleep, when the mind is free to wander where it will beyond the constraints of the collapsed wave packet. That mind might well find itself slipping into the territory of another version of Me when I'm asleep, even for just a few moments, a version in which the energy required to act out the events of the moment is such that it grabs any available input from extraordinary sources - the energy of my consciousness when I'm sleeping being one of those extraordinary sources. This could explain the rise in energy we automatically receive when we face critical circumstances; the hormone surge biologically activated may, in order to fuel its activity, be accessing energy available from sleeping versions of ourselves across the multiversal matrix.
There's an option here to put some research into this, with all that has recently been discovered in neuroscience; proving our connections with other versions of ourselves could open doors to a great deal of empowerment, and enable many people to explore ways out of night terrors and other unwanted coils of dreamscape mechanics they might wish to avoid in the future. While we can control our dreams even less (arguably) than we can control the reality of our lives, we know that our perspective creates the foundation for the way we live, and that has to count for something substantial if we are spending a third of our lives trawling through the multiversal wide-wide-web.