What separates illusion from reality?

Illusion cannot exist independently of reality. Imagination-making up images-does not construct illusion alone. Rather, illusion is also a phenomenon involving our perception of reality, whether it is a "true" representation of that reality or not. Today it is rare to experience unadulterated reality directly.

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Also, what is illusion vs reality?

Illusion - an instance of a wrong or misinterpreted perception of sensory experience. Reality - the state of things as they exist, as opposed to an idealistic or notional idea of them. Why do we forget our dreams? WE FORGET almost all dreams soon after waking up. Our forgetfulness is generally attributed to neurochemical conditions in the brain that occur during REM sleep, a phase of sleep characterized by rapid eye movements and dreaming. The dreaming/reverie end involves some of the most creative and "far out" material.

Why do memories stick?

Summary: Multiple neurons in the brain must fire in synchrony to create persistent memories tied to intense emotions, new research has found. Memories linked with strong emotions often become seared in the brain. One may also ask are thoughts made of matter? Thoughts are not ethereal. They are representations of matter and are encoded in matter. They have shape and weight. Abstract ideas are analogically built from more concrete sensory representations.

Where do memories go when they are forgotten?

The more often a memory is recalled, the stronger its neural network becomes. Over time, and through consistent recall, the memory becomes encoded in both the hippocampus and the cortex. Eventually, it exists independently in the cortex, where it is put away for long-term storage.