For me, as a neurosurgeon and a research scientist, dreams hold a particular fascination. Having spent my life immersed in the brain, I am not only infatuated by its infinite complexity but captivated to the point of obsession by what remains one of its greatest and most mysterious features — dreaming.The source of dreams is the same as all mental activity, waves of electricity moving across the brain every moment we’re alive. Dreams are a product of normal brain function, and an extraordinary transformation that occurs in the brain each night when we sleep, following the circadian rhythms — the day-night cycles — that biologically govern all life.Each night, our brains and bodies follow a repeating 90-minute cycle of light sleep followed by deep sleep, where the brainwaves are slow and rhythmic. The eyes start rolling under their lids and most of the muscles in the body become paralysed. When the eyes are fluttering under the eyelids, this is known as rapid eye movement or REM sleep.
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