Comment by tirant
5 days ago
I have lost consciousness several times in my life. Not a pleasurable experience specially as last time I did it because of such extreme pain that I thought I was passing away.
However I have had always recollection of those seconds or minutes when I was unconscious: there was always an intense and quick succession of memories and images accompanied by sound. At some point the external sound from people trying to reanimate me took over and I was able to gain consciousness again.
I always felt that was how the brain acted before passing away, and also how some literature and cinema were right when depicting flashbacks.
For contrast, when I was put under with propofol for surgery, there was nothing.
I thought I would gently fall asleep, but it was actually extremely fast. It went from "tell me about your life" which the anesthetist uses to check your state to "oh so came here for uni..." to "huh the surgery is over" in a single cut.
Nothing in between, nothing like that thing you feel when before you fall asleep at night or wake up in the morning. I felt tired when I woke up, but I didn't think I had dreamed or felt anything at all in between.
I had a procedure recently and the description in the preparation instructions said "you won't be asleep, but you might not remember everything"
I talked to the nurse about this as I was prepping for the procedure, and he said that a recent patient talked throughout the procedure, but when he got back to his room afterwards, he asked "so when will the procedure start?"
So, I think the drugs you get might let experience everything. But the "nothing in between" might actually be memory loss, not loss of consciousness.
all this stuff is spooky and philosophically tricky.
Benzodiazepines = memory loss Propofol = we turned your brain off
Nothing stops us from using both, where strategically appropriate.
That sounds more like fentanyl (which is widely used as anesthesia for minor surgeries). With fentanyl you'll be awake but loopy and not fully there. Propofol feels like time had an entire section removed with before and after spliced directly together.
1 reply →
Anesthetics are very weird though. There's still a lot we don't know about how they work. They seem to act like you experienced, complete shutdown, for most people, which seems different from the states that people go into when unconscious or are near death usually.
And some people have a very different experience while under them - they are fully aware.
I had heard something unsettling about anesthesia that I could use verification or debunking.
The gist was that modern implementations suppress memory formation rather than induce unconsciousness. That you remain in some sense aware of what's happening but don't remember the experience. This is safer than traditional methods, but could potentially subject the patient to complex mental or emotional trauma.
Is that accurate?
19 replies →
> Nothing in between, nothing like that thing you feel when before you fall asleep at night or wake up in the morning.
Same. I was put under twice and both times it was like someone flipping a switch from conscious to unconscious. When I woke up it was like nothing happened save for a slight groggy feeling. It was not like sleep where you feel rested, as if you lost time.
edit: to add when going under the first time I was laying down on the operating table as the anesthesiologist made small talk with a nurse I suddenly felt super high while the room started to spin - POOF out.
My first time I remember the anesthesiologist asking me to count backwards from 100. I assumed the process would take 30 to 60 seconds. I don't think I even hit 97..
Yeah, mine was count down from ten. Made it to eight, then I was in a different room and an hour had passed. Closest thing to time travel.
On (In?) my last surgery they did the "make sure to remember what you dream" spiel on me. I dreamt I was having a surgery. After the surgery no one came to ask me what I've dreamt, it left me feeling quite a bit disappointed.
Yeah, people think they can "fight" it, but you can't. That stuff will knock you out. The counting is just so they know when you're out.
8 replies →
I've only been put under once and it was when I was very, very young (3 for hernia surgery, I'm in my mid-40s now) and I had a similar experience, except I came to ~half way through and picked up my head, wondering what the fuck was happening to me, before promptly being put under again. It's my earliest memory but it's also one of the only strong memories I have before 6-7 years old.
Had the same experience, what scared the crap out of me is that feeling of not even knowing you're out is how some people spend their last moment.
Not just in surgery for example but in extreme other situations (nukes, titan sub, piano to the head, etc)... You're just there then you aren't and you don't even know. Shook me (lightly) for a while
For me it gave me some peace about death. Say you are vaporized by a nuke. You're walking around chatting one moment, and there is no next moment.
I'm guessing being properly flattened by a truck is similar, though of course that's adjacent to being severely injured and dying later.
That's basically sleep for me. I know I must dream but I only very rarely even remember the smallest fragment of any dreams. So sleeping is like I've not existed for 7 hours from my conscious perspective.
3 replies →
Honestly it doesn’t sound too bad to me. Just blinking out of existence. No pain, no regret. So what’s there to be scared of?
4 replies →
I got put under as a teen for an appendectomy. Shocking. I was absolutely 100% certain I'd stay awake while counting until I hit at least 2-3. I think I made it to 8, then yeah - just like a scene change in a show. I was simply suddenly somewhere else - the recovery room. Apparently I tried to fight the nurses because I wanted to lay on my side (that had JUST been cut open)? I literally have no memory and apologized profusely. I don't even know how that happened - I'm not a violent man. I've been in one (very minor) fight (middle school), and I'm super easy-going in general. It takes a LOT to get under my skin.
> It takes a LOT to get under my skin.
Ouch. Excessively appropriate choice of words there.
They really got under your skin.
Yes, I experienced the same, it was like what they call in cinema a "jump cut". I remember the doors to the OR opening, then bang i was in a bed in the recovery room. Like the universe glitched.
Pretty much the same experience when I had surgery. Just a complete jump over the time I was out. I remember the mask going on, counting backwards, and then I was waking up. No sense whatsoever that any time had passed.
> I thought I would gently fall asleep , but it was actually extremely fast.
Sometimes people fall asleep that way too, especially when very tired. The expression ‘out like a light’ seems apt.
There was nothing that you remember. That means there probably was nothing, but it's still a distinction that should be noted.
Last time I had a medical intervention with propofol I returned so relaxed that I thought I had died and was in the afterlife.
They usually ask me to "count backwards from 10". I don't think I get down to 0. It's _very_ fast.
https://www.newyorker.com/magazine/2011/04/25/the-possibilia...
When David Eagleman was eight years old, he fell off a roof and kept on falling. Or so it seemed at the time. His family was living outside Albuquerque, in the foothills of the Sandia Mountains. There were only a few other houses around, scattered among the bunchgrass and the cholla cactus, and a new construction site was the Eagleman boys’ idea of a perfect playground. David and his older brother, Joel, had ridden their dirt bikes to a half-finished adobe house about a quarter of a mile away. When they’d explored the rooms below, David scrambled up a wooden ladder to the roof. He stood there for a few minutes taking in the view—west across desert and subdivision to the city rising in the distance—then walked over the newly laid tar paper to a ledge above the living room. “It looked stiff,” he told me recently. “So I stepped onto the edge of it.”
In the years since, Eagleman has collected hundreds of stories like his, and they almost all share the same quality: in life-threatening situations, time seems to slow down. He remembers the feeling clearly, he says. His body stumbles forward as the tar paper tears free at his feet. His hands stretch toward the ledge, but it’s out of reach. The brick floor floats upward—some shiny nails are scattered across it—as his body rotates weightlessly above the ground. It’s a moment of absolute calm and eerie mental acuity. But the thing he remembers best is the thought that struck him in midair: this must be how Alice felt when she was tumbling down the rabbit hole.
Something like that happened to me in first grade. I was trying to go down a slide and a friend decided to climb the slide itself. He ended up launching me off the side of the slide. It was maybe a five or six foot slide, and I remember going over the side in slow motion, grabbing for the rim of the slide but being at least 6" away from reaching it, and then suddenly.. sharp pain and pitch black as I landed on my back.
I was conscious again about 10-15 seconds later. It's the kind of thing that sticks with you your whole life. It probably wasn't close to life threatening, but the combination of adrenaline, sharp pain, and brief unconsciousness definitely leaves an imprint in your memory.
"With effortless focus, Munenori Sensei smoothly pulls the arrow to bend his bow. Released like a ripe fruit, the arrow glides. It races toward your heart.
In the eternity of the arrow’s flight, you wonder: What is this present moment? Confronting its end, your mind becomes razor sharp, cleav- ing time into uncountable, quickly passing moments.
At one such perfect instant you see the arrow as it floats, suspended between the finest ticks of the most precise clock. In this instant of no time, the arrow has no motion, and nothing pushes or pulls it toward your heart. How, then, does it move?
While your beginner’s mind embraces the mystery, the arrow flies."
Long time ago, while running cat5 in a large open ceiling, I stepped off of a large metal beam onto what I thought was the concrete ceiling of an outdoor awning, but was in fact droptile. Fell right through, of course, and landed more-or-less on my back. The floor was that hard institutional carpet.
I don't remember anything about the fall itself. After hitting the floor I immediately got to my feet, realized the breath had been knocked out of me, tried to call my partner's name, then sat back down. I think the pain came shortly after that.
Had a similar incident in my teens.
I was at scouts and we’d set up a monkey swing on a branch next to a river.
While I was on it, I somehow realised the knot on the branch was coming undone and was able to witness its unravelling in slow motion.
The fall was also slow, as I hit the ground I cried out, but more from shock than any pain.
Very luckily I had landed on the soft sandy riverbank rather than the rocks in the river I had been above just moments before.
It’s not surprising that in life threatening situations the brain would focus all of its attention on the immediate situation, rather than worrying about the usual crap the brain worries about (like paying your bills).
I once had my life threatened and experiences that too - the (past) life flashing before your eyes. My thought was the brain was desperately trying to find a way out of the situation by searching for anything similar it had experienced. Was really interesting to experience.
agree with this; fits with how the brain values recording of memories when adrenaline is present
"Near death experience" or "out-of-body experience" are two search terms that surface more accounts like this.
I once lost consciousness after a bad bike wreck that left me bleeding significantly from both knees. I lost consciousness while sitting on a bench waiting for my wife to arrive after walking my bike back to the trail head.
I remember having a very vivid and pleasant dream (riding in a car with some friends and laughing) while I was "out". I came-to when a bystander started beckoning to me ("Sir! Sir!"). Their calls bled into my dream first, then I awoke and realized I was laying face-down in the grass by the bench.
The pain was gone in the dream, but, of course, came back when I awoke. I sort of wished I could just pass out again.
Interestingly that dream has stuck with me in a way that typical sleeping dreams don't.
I got knocked off my bike about 20 years ago and was unconcious long enough that an ambulance had arrived.
I don't remember a thing between seeing the car pull out infront of me and waking up on the floor looking at the ambulance.
Same here, I flew head first down a ramp because I slammed the breakes too hard and the next thing I remember is people asking if anybody had a handkerchief or something, since my head was bleeding. A solid five minute blackout.
I've also lost it, around ~10 times so far. Never have any dreams or flashbacks. Just before passing out, I realize what's going to happen, but it's often too late. I only have a terrible headache afterwards.
10 times? Wow.. That seems like a lot.. AFAIK, even once is indication of potentially serious trauma.
Depends on the source. I've been doing nogi BJJ (not on the comp team: I am old, we train hard but not competition hard) about ten years or so.
People training technique will grey out pretty much routinely as they talk through things with their partners and work strategies for techniques.
People go out now and then, usually on purpose with folks who understand when it happens.
The BJJ community is mature at this point. There are folks on comp teams basically having fights every day. I suspect when those people go out, you are right. Damage is done and it accumulates.
I suspect when folks like me and my training partners go out, there is no trauma to speak of.
What is the net of this lifestyle? I don't know; I've had no major injuries (requiring surgery or major downtime-- popping the cartilage in your rib working top control drills will take fucking forever to heal tho), I've learned a lot, made good friends, and have only this life to spend as I see fit, so I can only anecdata.
But the understanding in our world is this: trauma is traumatic (and sometimes causes loss of consciousness, sometimes not), but not all loss of consciousness is traumatic.
I've passed out about that many times in my life as well. I'm very sensitive to dehydration and it can sneak up on me and drop my blood pressure enough that down I go. Happens maybe once every five to six years.
I don't have any crazy memories when I'm out. But coming back to, I always feel like there's something I just can't remember, it's just out of reach, at the tip of my tongue... and then my sight comes back and I can place where I am, but it feels like I've been gone for a very long time and am returning to the past, and then everything snaps in place and I'm back to normal.
Being put under with anesthetic feels very different. With that, I simply pop out and then pop back in.
I had similar expirience. Time slowed down like 500x, and I had dream like visions and flashbacks - all within 1,2 seconds before hitting the ground.
From my perspective that was worth about 1h of dreaming normally.
all of my incidents of losing consciousness were absolute voids to me. Once I apparently hit the back of a car on my bike and I just kind of woke up with no idea what had happened (I say "apparently" because I don't really know... I was riding my bike and suddenly I was laying on the side of the road, no in between. The other time my father punched me in the face, knocking the back of my head into the corner of a metal oven hood. I remember that but then the next thing was coming to on the ground with him over me, hands around my neck squeezing. Nothing whatsoever in between the start and end of events.
I passed out in the gym doing a set of deadlifts. I remember setting the bar down and then I was on the floor next to it. Was just a few moments. No flashbacks or anything, just momentary oxygen depletion.
So is it similar to dreaming?
Also, what do you mean by "sound"? Like music or actual sound from your memories?
Part of it has to do with the memories, which gradually gets overtaken by the voices of my wife, doctor or whomever was trying to wake me up.
As an example, I think I was around 16 years old and I was very much into sport cycling and Tour de France. When I lost consciousness a slide show of Tour de France competition accompanied by the TV commentators rush into my thoughts. All of it at very high speed and extremely overwhelming.
I think of it as an analogy of a memory dump of a process that is no longer running (consciousness), and everything gets just read and dump at high speed and without any sense nor capacity to make sense of it, only leaving a small impression in my short memory area which afterwards I was able to remember for longer time.
Ha! I like the thought of unconciousness triggering a "kernel OOPS" and the brain dumping out a backtrace of everything. Makes you wonder who is supposed to debug it later ...
Very interesting thanks for sharing. And also a bit scary. It seems like you have found ways to live with this condition.
I’ve had similar experiences.
In my case it wasn’t like dreaming exactly, more like that in between state where you’re falling into a nap but still awake. Sound was kinda like being underwater, in fact recovering consciousness very much felt like surfacing into reality for lack of a better term.
It was kinda cozy, definitely not an experience to be scared of.
Coziness was something I did not experience as my conscious losses were always triggered by highly stressful situations (pain, fear). For me it was extremely overwhelming, as if my brain was on overdrive.
It's an amazing sensation. Not a pleasant one.
huh I guess movies got that part right. I wonder what was the first movie with a scene like this