Intro Psych 4. States of Consciousness

Unpacking the Circadian Rhythm and Sleep's Hidden Costs OK, I want you to picture something for a second. Imagine you have a machine in your house and every single night this machine makes you lie down. It paralyzes your body from the neck down. And then it just, IT projects these intense, really bizarre 3 dimensional hallucinations directly into your brain for hours. And here's the kicker, if you don't get in the machine, you eventually die. Speaker 2 Wow, when you frame it like that, it sounds less like a biological necessity and more like the plot of a dystopian horror movie. Speaker 1 But it's just Tuesday night, we're talking about sleep and, you know, the mystery of consciousness. And I think because we do it every night, we just take it for granted. Oh, completely. But I actually ran the numbers based on the research for today's Deep Dive. The average person spends about 25 years of their life sleeping. Speaker 2 25. Speaker 1 Years 1/4 of a century spent in this this altered state. Speaker 2 It is staggering. And, you know, for most of human history, we just assumed sleep was a passive state, like turning off a car engine. Speaker 1 You park it, turn the key, nothing happens till morning. Speaker 2 Exactly. But what modern psychology shows us is that when we power down, the brain isn't turning off at all. It's actually entering this high security, high activity biological workshop. Speaker 1 And that's exactly what we're here to unpack. We're not just talking about getting 8 hours. We're talking about the biological clock that rules our hormones, the the weird architecture of our sleep cycles. Speaker 2 And the terrifying things that happen when those cycles break. Speaker 1 Yes, and how we manually hack our own consciousness with chemicals. Speaker 2 It's a huge topic and I think we have to start with the hardware because consciousness isn't just awake or asleep. It's a good continuum and it's regulated by a very, very strict rhythm. Speaker 1 The circadian rhythm, that 24 hour cycle. Speaker 2 Right. And most people know they have a body clock, but they don't realize there's an actual physical spot for it in the brain. It's this tiny cluster of cells in the hypothalamus called a suprachiasmatic nucleus, the SCN. Speaker 1 I was reading about the SCN and it's kind of terrifying how small this thing is compared to the control it has over us. It's basically the CEO of the body, right? Speaker 2 Absolutely. It is the master time keeper and it works on a surprisingly simple input. Speaker 1 Light, rest light. Speaker 2 Your SCN is hardwired to your eyes, so when light hits your retinas, the SCN signals the pineal gland to, you know, hold fire. But when the sun goes down and that light fades. Speaker 1 The SCN gives the green light. Speaker 2 It tells the pineal gland to release melatonin. Speaker 1 Which is the sleep hormone? Speaker 2 It's more the biochemical signal for darkness. It's what tells every single cell in your body that it's time to rest. The system is elegant. It's ancient and it worked perfectly for millions of years. Speaker 1 Until we invented the light bulb. Speaker 2 And then the airplane. Speaker 1 And the smartphone. Now we are constantly blasting our retinas with blue light at midnight, telling our SCN that it's high noon. Speaker 2 We are essentially at war with our own biology. We see this most clearly with jet lag, which is just a mismatch between your internal clock and the outside world. But the research points to something much more insidious. Rotating shift work. Speaker 1 Oh there is that specific study on this that really stuck with me. The one on middle-aged nurses. And it wasn't just that they were tired. Speaker 2 No, not at all. The qualitative data from that study was just heartbreaking. It showed how disrupting the circadian rhythm bleeds into everything else. These nurses reported the state of like persistent agitation. Speaker 1 And the impact on their families was a key finding. Speaker 2 It was huge. One nurse described how even when she was off work physically there with her partner, she was too exhausted to have any good time or or real emotional connection. Speaker 1 That's the tragedy of it. It's not just I'm sleepy, it's I don't have the biological bandwidth to love my family right now. Speaker 2 Precisely. It creates this friction that just erodes relationships and physically the cost is so high. We talk about sleep debt like it's something we can pay back on the weekend. Speaker 1 But the body keeps a very strict Ledger. Speaker 2 And the interest rates are terrible. Yeah, they really are. When you accumulate sleep debt, your alertness drops, sure, But we also see depression like symptoms. We see a link to obesity because sleep deprivation messes with your hunger hormones. We see immune suppression. Speaker 1 And if you push it to the absolute extreme, I saw a note that if you stay awake for what, 48 consecutive hours? The barrier between reality and dreaming. Just it dissolves. Speaker 2 The brain forces the issue. You start to hallucinate. Your brain needs to dream so badly that it'll just start projecting dream imagery right onto your waking reality. Journey Through Sleep Cycles and Terrifying Malfunctions Which is a perfect segue into what happens when we actually do fall asleep. Because I used to think you just, you know, closed your eyes and drifted into nothingness. But the architecture of sleep is it's a journey downwards. Speaker 2 It is the descent, we call it an R.E.M., non rapid eye movement sleep, and it starts with stage 1. You know that feeling when you're nodding off in the meeting? Your head drops and you jerk back up. Speaker 1 And you immediately lie and say I was just resting my eyes. Speaker 2 That is stage 1. Your brain waves are slowing from beta, that's the awake state, down into alpha and then Theta waves. It's a twilight zone. You're technically asleep, but you still have 1 foot in reality. Speaker 1 Then we hit stage 2 and this is where it gets a little technical. I read about sleep spindles and K complexes. Speaker 2 Right. So stage 2 is deep relaxation and these sleep spindles are sudden bursts of high frequency brain waves. We think this is the brain basically hitting safe on the day's documents. Speaker 1 For memory. Speaker 2 Crucial for memory consolidation and the K complexes. Speaker 1 What are those about? Speaker 2 Those are fascinating. They're these high amplitude spikes and brain activity that happened in response to things in your environment. Speaker 1 So let's say a dog barks down the street. My brain hears it, processes it, creates AK Complex and basically decides that's not a threat. Stay asleep. Speaker 2 Exactly. The bridge mechanism keeps you under, but then if we're lucky we descended to stage 3 slow a sleep delta. Speaker 1 Waves, the deep ocean, the. Speaker 2 Deepest. Your heart rate slows to a crawl. Your breathing is rhythmic and slow. This is where all the physical restoration happens. It's incredibly hard to wake someone up from stage 3. Speaker 1 And they're super groggy if you do. Speaker 2 Totally confused but we don't stay there. We cycle back up and this is the part that always blows my mind. We enter REM sleep. Rapid eye movement. Speaker 1 And they call it paradoxical sleep. Why is it a paradox? Speaker 2 Because if I hooked you up to an EEG during R.E.M., your brain waves would look almost identical to when you're wide awake. Your brain is on fire, high activity, but, and this is the crucial safety valve, your voluntary muscles are completely paralyzed. Speaker 1 So you're a manic, active mind trapped inside a frozen body. You. Speaker 2 Have to be because this is where the most vivid dreaming happens if you weren't paralyzed, you'd be acting out all those dreams which. Speaker 1 Brings up the question why? Why do we do this? Why did we evolve to spend hours paralyzed and hallucinating? Well, there. Speaker 2 Are a few theories. 1 is the adaptive or evolutionary theory. The idea is that for early humans, night was dangerous. Predators were out. Speaker 1 So stay still. Speaker 2 Exactly. Evolving A mechanism to force us to lie still and quiet in a cave somewhere probably increased our survival odds. Speaker 1 Don't go out there, you'll get eaten. Just stay here and hallucinate for a while. Speaker 2 Essentially. But there's also the cognitive theory that sleep is for memory, for creative problem solving. We know REM sleep is vital for emotional regulation. If you deprive someone of R.E.M, wake them up every time they start dreaming. They get anxious, irritable. Speaker 1 And the body fights back, right? There's that R.E.M. Rebound. Speaker 2 Yes, if you miss R.E.M. One night, the next night your brain will just skip the other stages and dive straight into R.E.M. to catch up. It prioritizes it. Speaker 1 It's amazing machinery, but like any complex machine, it can break. And when sleep breaks, it gets scary. Speaker 2 The disorders we. Speaker 1 Have to talk about the Scott Falloter case. I did a double tick when I read. Speaker 2 This it is one of the most famous and frankly chilling cases in sleep science. Speaker 1 So for everyone listening, it's 1997. Scott Faluter is a seemingly normal family man. One night he stabs his wife 44 times. Speaker 2 44. Speaker 1 He drags her body into the backyard, rolls her into the swimming pool. Then he goes inside, changes his clothes and hides the knife in the spare tire well of his car. Speaker 2 It sounds like cold blooded, premeditated murder. Speaker 1 It does, but here's the detail that complicates everything. A neighbor saw part of this. They saw Faluter motioning to the family dog to sit and stay while he was dragging the body. Speaker 2 And he paused to fix the pool pump. Speaker 1 Right. And when the police police arrived, he seemed genuinely confused. He claimed he'd been sleeping the whole time. His defense was sleepwalking. Speaker 2 I was asleep. Your honor, it sounds like the ultimate dog ate my homework excuse. Speaker 1 It really does. But biologically, is it even possible? Speaker 2 Well, that's the thing, it is. Folater had a history of sleepwalking. And remember stage 3 deep slow wave sleep, That's where sleepwalking happens. It does not happen in realm right? In stage 3, your muscles work, but your higher executive functions, your morality, your logic, they're all offline. You can perform complex rote tasks like fixing a pool pump or quieting a dog, but you are not conscious. Speaker 1 That is terrifying that you can be a complex moving agent in the world capable of violence without being there. Speaker 2 The jury didn't buy it. He was found guilty of first degree murder, but sleep experts still debate it to this day. It highlights that awake and conscious are two very different things. Speaker 1 Then you have the flip side of that Sleepwalking is moving when you shouldn't. REM Sleep Behavior Disorder, or RBB, is moving when you should be paralyzed. Speaker 2 Correct. In RBD that paralysis mechanism in R.E.M. just fails. So the brain is dreaming, it's fighting a tiger, and the body actually throws a punch. These patients kick, scream, thrash in their sleep and it's a serious warning sign. It's strongly linked to developing neurodegenerative diseases like Parkinson's later in life. Speaker 1 It's like the brain's control panel is starting to short circuit. And then there's narcolepsy, which has maybe the weirdest symptom of all, cataplexy. Speaker 2 Cataplexy is It's surreal, it's sudden muscle weakness or paralysis, but it happens while you're wide awake. Speaker 1 And it's triggered by strong emotion. Usually yes. So you tell some of the narcolepsy a great joke, they start to laugh and boom, they just collapse. Speaker 2 The body confuses that feeling of joy with the signal for REM sleep and initiates the paralysis protocol. It's caused by a lack of a specific neurotransmitter called hippocrete. Decoding Dreams and Hacking Consciousness with Chemicals Speaking of things happening in our heads, dreams, we've been trying to figure out what they mean forever. You have Freud, who thought everything was a secret code for sex and aggression. Speaker 2 The manifest content was his story, and the Leeton content was the hidden wish. A train entering a tunnel is never just a train for Freud. Speaker 1 Never just a train, but modern science has moved on a bit. I really like the study by Rosalynn Cartwright. She took a much more practical approach. Speaker 2 She did. She studied women going through a divorce and she found a direct empirical correlation. The women who spent more time ruminating, thinking about their ex husbands during the waking day were the ones who dreamed about them at night. Speaker 1 So dreams aren't necessarily these cryptic messages from the beyond, they're just the brain continuing to chew on the day's problems. Speaker 2 Exactly. It supports the idea that dreams are reflective of our life events. But there's another theory that I find really compelling from Allen Hobson. He moves from activation synthesis, the idea that dreams are just random noise, right? And proposed proto consciousness. Speaker 1 This is the virtual reality theory, yes. Speaker 2 The idea that the brain is building an internal simulation, a virtual world to help us predict and prepare for the waking world. It's a training ground. Speaker 1 A training ground where the laws of physics are optional. Now, humans have never been content to just let the brain do its own thing. We have a long, long history of trying to hack the system with chemistry. Speaker 2 Psychoactive drugs. Speaker 1 We should probably breakdown how these actually work. We hear agonists and antagonists, but what does that really mean? Speaker 2 OK, so think of your brain cells as having millions of tiny keyholes receptors and your body makes keys neurotransmitters to fit them. When a key turns, a message is sent. Drugs hijack this system. And agonist is like a master key, it mimics the natural key and turns the lock, sometimes even better than the real 1. And antagonist is different. It goes into the keyhole and just sits there, blocks the lock. Speaker 1 So it prevents the real key from getting in exactly. Let's apply that to the drug that probably 90% of our listeners are on right now, caffeine. Speaker 2 Caffeine is a classic antagonist. In your brain, there's a chemical called adenosine. Think of adenosine like like brake fluid. Throughout the day it builds up, putting pressure on the brakes, making you feel tired. Speaker 1 And caffeine is what, a brick under the pedal? Speaker 2 That's a great way to put it. Caffeine jams a brick under the brake pedal so you can't push it down. It blocks the adenosine receptors. The tiredness chemical is still there, building up, but the brain can't feel it which. Speaker 1 Explains the crash. Once the caffeine wears off, the brick is removed. All that built up brake fluid hits the system at once. Speaker 2 Exactly. You haven't gained any energy, you've just deferred the fatigue. Speaker 1 OK, now let's look at something more dangerous. Cocaine or emphetic? They play with dopamine. Speaker 2 These are stimulants, and their mechanism is a bit different. Normally your brain releases dopamine to signal pleasure or reward, and then little vacuums come along and suck it back up to be recycled. That's called reuptake. Speaker 1 And cocaine breaks the vacuum cleaner. Speaker 2 It blocks the reuptake, so the dopamine gets released, but it just stays in that gap between neurons, pinging the pleasure button over and over and over again. Speaker 1 That sounds intense, but the brain adapts, doesn't it? Speaker 2 Tragically, yes. The brain realizes there's too much noise, so it starts removing its own receptors. It turns down the volume, which means eventually you can't feel normal pleasure from a sunset or a good meal. You need the drug just to feel OK. Speaker 1 And that's the cycle of addiction. Speaker 2 Then you have the other end of the spectrum. Opioids, Heroin, Fentanyl, Oxycontin. Speaker 1 These mimic our bodies own painkillers endorsens they're agonists. They bind to opioid receptors to create euphoria and numb pain. But here's the fatal flaw in our biology. Those same receptors are also in the brain stem, which controls breathing. So that's why an overdose kills you It's not usually a heart attack. You just forget to breathe the. Speaker 2 Signal to inhale is simply silenced. Speaker 1 It really highlights how fragile our consciousness is. A tiny chemical change and we're manic. A different change. We stop breathing. But there are ways to alter consciousness that don't involve external chemicals, right? Altering Consciousness Without Drugs: Hypnosis to Lucid Dreams The research mentions hypnosis and meditation. Speaker 2 And hypnosis is one of those things that gets a bad rap because of stage magicians. Cluck like a chicken, all that. Speaker 1 But there is real science there, especially when it comes to pain. Speaker 2 Yes, the leading theory involves dissociation, the idea that you can literally split your consciousness. There was a famous study by Ernest Hilgard, the ice water study, this one. Speaker 1 Gave me the creeps. Speaker 2 It is unsettling. So Hillgard hypnotized subjects and suggested they would feel no pain. He then had them put their arms into freezing ice water and they sat there looking calm, verbally reporting no pain. Speaker 1 But he had a trick up his sleeve. Speaker 2 He did. He told them that there was a hidden observer, a part of their mind that was still watching, and he asked them to press a button with their other hand if some part of them felt pain. Speaker 1 And they pressed the button. Speaker 2 They pressed it. Speaker 1 That is the stuff of horror movies. The person is smiling and saying I'm fine, but there's a silent passenger inside just screaming. This hurts. Speaker 2 It suggests that consciousness isn't a single spotlight. It can be split. One part can be suffering while the executive part is completely unaware. Speaker 1 And meditation seems to be the opposite of that split. It's about integration. Speaker 2 Right. Whether it's mindfulness or focused attention, meditation is about taking manual control of your attention. And unlike hypnosis, which is often about suggestion, meditation has been shown to physically change the brain. It can thicken the cortex, lower blood pressure, help manage stress. Speaker 1 So it's a way of calming that monkey mind without the chemical crash of alcohol or drugs. Speaker 2 Exactly. Speaker 1 So we've been on quite a journey here. We've gone from the microscopic SCN and the hypothalamus down into the delta waves of deep sleep through the paralysis of R.E.M. And looked at how easily we can scramble this whole system. Speaker 2 For me, the big take away is humility. We walk around thinking I am me, I am in control. But this research shows that you are a construct completely dependent on a very specific balance of neurotransmitters, circadian rhythms and sleep architecture. Speaker 1 Tweak the melatonin or block the adenosine, or interrupt the R.E.M. Cycle. Speaker 2 And the you that wakes up is a different person. Speaker 1 We are biological machines that spend a third of our lives hallucinating in the dark just to keep the software running. Speaker 2 That is certainly one way to look at it. Speaker 1 Before we wrap up, I want to leave the listener with one final thought. We touched on Hobson's theory of Dreaming as a virtual reality simulation. Speaker 2 Proto Consciousness. Speaker 1 The research briefly mentions lucid germing. This is the state where you wake up inside the dream. You realize, wait, this is a simulation. Speaker 2 And because you know it's a simulation, you can take control. Speaker 1 You can fly, you can change to the weather, you can talk to the dream characters. Speaker 2 It's the ultimate altered state, conscious awareness maintaining itself inside an unconscious construction. Speaker 1 So if the brain builds a virtual reality every night to test us, what does it say about human potential that we can sometimes hack the code and become the architect of our own simulation? Just something to think about tonight when you close your eyes. Speaker 2 If you can sleep after hearing about the hidden observer. Speaker 1 Just get your 8 hours. Speaker 2 Always. Speaker 1 Thanks for listening to the deep dive. We'll see you next time.