Anti-Realism One way to view lucid dreaming is that the light we see during the day has slowed down considerable. Then our mind moves faster than a slowed down speed of light when we flick past visual scenes during sleep. The speed of light is variable relative to our own dreaming mind but not between people in the physical world. The speed of light is the speed of gravity. Yet we don't feel gravity when we're asleep since we're paralysed. Thus if gravity is reduced then perhaps the speed of light is reduced internally.
"We consider the special case in which there is no interaction inside the closed timelike curve, referred to as an open timelike curve (OTC), for which the only local effect is to increase the time elapsed by a clock carried by the system. Remarkably, circuits with access to OTCs are shown to violate Heisenberg’s uncertainty principle, allowing perfect state discrimination and perfect cloning of coherent states. The model is extended to wave packets and smoothly recovers standard quantum mechanics in an appropriate physical limit. The analogy with general relativistic time dilation suggests that OTCs provide a novel alternative to existing proposals for the behavior of quantum systems under gravity."
journals aps org