00:00a night is darker than you think somewhere in that stillness while the world sleeps the brain
00:08begins its own secret symphony a performance so mysterious that for centuries no one could
00:17even name its instruments welcome to mindology i'm zaynab sabir and tonight we're diving deep
00:26into the realm where your mind wanders when your eyes are closed the strange thrilling worlds of
00:35nrem and ren sleep this is more than science it's a journey into the hidden theater of your brain
00:44where dreams are born and reality blurs before we drift into this mystery don't forget to like this
00:53video and subscribe to mindology for more fascinating explorations of the mind you don't want to miss the
01:02stories your own brain is whispering to you in the dark imagine this you fall asleep your breathing
01:11slows your body melts into stillness and yet inside your skull an electrifying drama begins
01:21it starts gently what scientists call nrem sleep non-rapid eye movement sleep this isn't just one
01:30thing it's a staircase of stages at the very first step stage one your brain hovers between wakefulness
01:40and dreaming strange flickers of images appear shadows flashes of color the feeling of falling
01:49a sound that might not be real these are hypnagogic hallucinations the fragile doorway into sleep
01:58your eyes drift slowly beneath your lids and your muscles loosen you're still half awake but the line
02:08between the two worlds is already blurring then comes stage two
02:14you are slipping deeper now your body temperature drops your heartbeat slows and your brain sends out
02:23sudden strange bursts of electrical energy spindles of light in the silence you wouldn't wake easily if
02:33someone whispered your name but the outside world hasn't vanished completely finally you tumble into the deepest
02:42part of nrem sleep stage three the heavy slow wave sleep your brain hums with delta waves the slowest rhythms
02:54of
02:54all your body is paralyzed your mind sinks into a stillness so profound it's almost like death
03:05this is the stage that repairs you that heals your cells and resets your brain if someone wakes you now
03:14you'll feel disoriented almost lost but here's the twist even here in this deep silence dreams can happen
03:26for decades scientists believed that dreaming belonged only to rem sleep the stage of wild brain activity and
03:35darting eyes but that was only part of the truth researchers like nielsen discovered that dreams are alive in
03:44nrem too though they feel different nrem dreams are often foggy repetitive like fragments of thoughts
03:53stitched together they can feel like memories like musings like faint sketches of another world rem dreams as
04:03as we'll see are more like paintings bright strange and alive and then just as the night feels deepest
04:13something extraordinary happens about 90 minutes after you first drifted off your brain ignites your eyes
04:24still closed begin to flick back and forth rapidly urgently as if they're scanning an invisible
04:33landscape this is rem sleep this is rem sleep the most mysterious most thrilling stage of all
04:40rem has been called paradoxical sleep because your brain looks almost awake electric storms firing across
04:49its surface while your body lies still locked in temporary paralysis only your eyes move darting beneath
04:59your lids and in this moment you are most alive inside your dreams researchers discovered this stage by accident
05:10in the 1950s a young scientist named eugene acerinsky wired up his son to a machine hoping to study blinking
05:20during sleep
05:21what he found instead stunned the world the boy's eyes were racing wildly long after he had fallen asleep
05:30at first acerinsky thought the machine was broken it wasn't he had stumbled into the secret world of rem sleep
05:40and in doing so had opened the door to dream science itself wake someone during rem and they will almost
05:49always tell you about a dream vivid strange and emotional sometimes it's a fantasy sometimes it's a nightmare
06:00in rem the mind creates landscapes out of nothing filling them with people you've loved places you've never been
06:10in and fears you've never speak aloud yet rem isn't just one single state it has its own secret rhythm
06:20there is a phasic stage where the eye movements are wild and dreams are rich and immersive
06:29and a tonic stage where the brain's activity shifts and the dreamer might be more open to the outside world
06:38in that stage a loud sound or a touch might pull you closer to waking or even slip into your
06:48dream
06:49twisting the storyline inside your head but dreams don't always follow the rules some rem periods bring no
06:58dreams at all and some nrem dreams are vivid and bizarre the boundaries are blurred and that makes sleep
07:07even stranger sometimes the body's defenses fail in rem sleep behavior disorder the paralysis that normally
07:18keeps your body still disappears and the dreamer moves kicks even fights in their sleep acting out their
07:27dreams in the real world why do we dream at all scientists once believed that rem caused dreams
07:36that if we studied it we'd unravel every mystery of the dreaming mind that hope was too simple dreams aren't
07:46tied
07:46to one single switch in the brain they happen across sleep stages tangled in waves of brain activity and flickers
07:55of memory but one thing is certain without sleep without rem without those deep nrem stages
08:04the mind unravels go long enough without them and you'll hallucinate lose control even collapse sleep isn't a luxury
08:15it's survival as the night unfolds your brain cycles between nrem and rem each about 90 minutes like tides rising
08:28and
08:28falling in your skull you drift down into darkness sink into deep sleep rise into dreams and fall again until
08:40morning finally comes by the time you open your eyes you've lived a dozen lives cross deserts and oceans seen
08:50faces you'll never see again all while your body stayed
08:54perfectly still and that's the wonder of it every night inside every one of us there is another world
09:02waiting a theater of the mind where reason sleeps and imagination reigns and rem sleep builds the stage
09:12rem sleep writes the script this is the mystery of sleep and the truth is
09:19we've only just begun to understand it thank you for wandering through this hidden world with me
09:25if tonight's journey into rem and nrem sleep fascinated you don't forget to like this video and subscribe to
09:34mindology there are countless more secrets of the brain to explore and we'll be right here waiting for you
09:43every time you close your eyes
09:47you
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