How does your body know what time it is? - Marco A. Sotomayor 

My body knew that it was time for a ted ed video so I'm here early

But how come when I take a long sleep in the afternoon I don't know what decade I'm in when I wake up.

I don't know how he didn't get bored to death.

Well, it's 2 a.m. and my body doesn't understand I need to go to sleep right now in order to function tomorrow..

As a person with ADHD, I can confirm I experience time differently than my peers and coworkers. I'm notorious for misjudging how long or short a task will take, and we have timers to help keep not only me on track, but to benefit all of us when we get into flow or distracted. Time is standardized, but it's experience is not standard.

This narrator's voice is so nice, could listen to him all day :)

What I find interesting is that most mornings, before I take a shower I start a timer for 13min20secs to tell me when to get out. Despite not having the same routine when I'm actually in the shower (taking more time washing my hair for example or simply enjoying the hot water) most of the time, I manage to leave the shower just a couple of seconds before the timer runs out. I get that intuition that it's time to get out and funnily enough, it is. That made me question the situation so I tried with different times like 15min or even 10 min and almost every time I managed to keep it really close to the set timer. I find it really fascinating.

The reason why I like TED Ed is that it has the answers to almost all of my silly questions

I guess that explains why I ALWAYS wake up at 9 o'clock.

"CLK." Scientists are *so* creative. Reminds me of the time engineers named a programming language "A," and then the second version "B," and the final version "C."

We need more people like Siffre willing to put themselves through this stuff.

What an amazing creation our bodies are!

I used to work in radio and all of my breaks were programmed around (multiples of) 30 second advertisements. After a few months I would instinctively know how long 30 seconds was - down to about a second of accuracy. I could be totally engrossed in a conversation or surfing the web during an ad break when something in the back of my brain would say "time's up!" - and it was. That was a number of years ago and the 30 second timer has faded away but it was a fascinating phenomenon when it was around.

This video made me sleepy.

우리몸이 시간을 어떻게 인지하는지, 쉽게 말해서 시계가 없어서 정확한 시간을 모르지만 우리가 먹고 자는 우리의 생활 사이클이 어떻게 언제나 비슷한지에 대하여 배워보는 시간이 되었습니다. 좋은 시간이 되었습니다. 감사합니다.

Either I have no circadian rhythm or it's extremely broken. None of this stuff happens for me.

This is why working from 9 P.m. to 6 A.m. fucks you up.

These lessons can really change anyone's life!!

I do not have this internal clock - I do not know when to eat or when to sleep - I gotta check the clock. And, I better do not mention catching the ball...

Ted-ed vids always have epic - timeless - ending.

'Only time will tell.' Wow

Honestly, my online classes are the only way I know what day and time it is. Otherwise I would sleep all day...

How did he record when he ate and slept if he had no clock.

I have a default alarm clock infused in my brain, so if I want to wake up super early for early work, I wake up naturally on the right time... how fabulous a creature I am.

The passing of moments are natural! The concept and (abuse) of systemic time is a decree, human management and expectation. Love to ALL

I am addicted to these videos.. These days I can’t sleep without watching one of TED...

"Only time will tell." +1 for ending . Thanks for good video.

I believe each brain has its own clock, so we are different! but all our clocks' timing are very close ( night is sleeping and day is working ). The problem is, today we have light everywhere and waves on our brains which change our timing from ppl back 1000years

Much sought video for days I was thinking about this type of content I landed in today's search. Thanks Ted

The first cave experiment demonstrating the circadian rhythm had actually been conducted by sleep researcher Nethaniel Kleitman back in 1938. He stayed in cave Mammoth, together with one colleague, for 32 days. Kleitman is largely considered the first sleep researcher.

This is so beautiful and amusing!

Thank you ted for making these videos! Love from India

4:36 At last, the face reveal of the voice of TED-Ed.

"maybe time's just a construct of human perception an illusion created by- MYAAAH MYAAAH MYAAAH MYAAAH MYAAAH MYAAAH MYAAAH MYAAAH MYAAAH MYAAAH MYAAAH MYAAAH MYAAAH MYAAAAAAAAAHHHHHHH"

"Zeitgebers" 😂 I wonder why such simple words are sometimes just not translated, but the plural is built with the English grammar rules.

perfect video ever thanks we need more like this

Why does watching tv or youtube right before bed makes me fall asleep faster?

Im a huge fan of chronosaucalogy... how much sauce you need at any given interval! GO SAUCE!

Mind blowing

I hate myself for watching this kind of video late at night.

Once upon a time, when I didn't have a watch, I could still tell you what time it was, with an accuracy of a minute or so. Even waking up in the middle of the night, I knew what time it was. How I did that, I don't know. Presently, I have a watch and a phone, so I don't have to rely on my brain any more.

I work nights. Maybe this is why I hate existence

Every time I heat some food in the microwave, I always get the signal that food is ready in about 10 sec before the food is actually ready to give me time to go to the microwave. This is so cool

Thanks for the information

I am addicted to your voice😁

Just one word, *Awesome*

guys i really like this channel and i will be pleased if you put bibliographic references about your investigation (just like a scientific paper does) . it will help a lot of people to investigate and keep learning :)

He didnt talk about Pineal gland which secreats Malatonin and pineal gland is responsible to keep track for time, which is another dimension of space apart from 3D-Space. Abilities of Pineal gland is more then, understood or shown, weather to connect us to higher dimensions etc.

thank you for this video!

I always go to get tea at 10:30, or around that time every night. Around that time I always get a craving for a cup of tea. I do this so often my family thinks I have an alarm set.

wonderful!!!

Awesome Video!!!!

재밌네요! 항상 잘보고갑니다🙂👍👍💘

"Only time will tell." You just had to fucking say it, huh?!

my science teacher loves your videos.

This makes sense, thanks for posting it! It also leaves me with a question: do the autonomous processes of the body differentiate between true sunlight and, say, a night light in your bedroom, when determining whether to shut off melatonin? In other words, should you never sleep with a night light on?

I'm watching this at 3:17am, nice

5:40 is my wake up time. I could set my watch to it.

THIS IS AWESOME DATA!!!!

I always wake up at roughly the same time (6:30 am) during te week and 10am during the weekend and I don't need a clock for that. I think this has to do with it

Great Video

Anticipate tube floor spending including raise second.

Omg I was just asking myself this today 😱

nice effort!!!

I really enjoyed it and i have a question: What about blind people? How does it work on them?

one time i remember waking up after a nap and i didnt remember anything. it was 9 at night but i didnt know because i didnt have my phone, at that point i was really confused because it was dark outside and i just woke up so i thought i overslept till 4 or 5.

awrsome vedio

This is such a good channel

My body is rather smart and uses the eyes to look for a clock. ^^

What if someone does a similar test but in a dark liveable box that travels around the world in different time zones via flying. Food will be catered somehow, sleep and wake time is monitored and the test will last 10 days. The test subject also does not know where it is landing therefore it does not know what time zone it is... It’s a 1am curiosity

I am watching this video 5:30 AM. I should be sleeping now but binge watching ted ed videos instead.

"Could each of us be experiencing time differently?" Yes we definitely are. It's called relativity.

what were his waking and sleeping hours though? how long did he sleep and how long did he stay up in between?

What about when you have to work overnight? Can you do a video on shift/sleep disorders?

Riddles please!!

The last question bears answer in itself already.

so is it possible for your brain to just not get some of these concepts? when ive been sick and not working or in school for long periods of time i would eat and sleep when i felt like it, and fell completely out of sync with day/night cycle. theres been lenty of times ive woken up in the dark and dont even know if its late or early.

my body never knows what time it is to go to bed

your the best

Cierto.

I thought meal times and how large those meals are also affects the circadian rhythm. Maybe even more significantly than blue light.

would love to watch how messed up body clock system can affect us.

press like when you set your oven timer and leave the kitchen only to beep at correct moment when you come back

So that is why even I sleep at 3am, I still wake at 7am due to the morning light.

Michael Stevens did similar experiment, but his results were much different. Did Siffre had a window in his isolated room? How did he get food? Could he talk with someone?

Probably someone has mentioned this before but... 4:22 if he counted to 120* in 5 minutes, then 1*=2.5sec, not 5sec! You don't even need the math 60x5/120, just intuition: it took him 2 minutes before and it was 1*=1sec, so if later it's 5 minutes to do the same then it's taking him x2.5 times longer

I guess Ted-Ed forgot to mention how Siffre kept track of when he slept and ate. I remember reading somewhere that he used a long telephone line to tell his assistant every time he woke up, ate and went to sleep.

Another result of this experiment was that the circadian rhythm he fell into was closer to like a 30 hour cycle.

Its odd cuz for 2 years now i hear a bell but piano sound and i hear it when its 23:00 and sometimes 20:01 and it happens even when i do not know what the time is. Its cool but odd and not scary it goes away after 5 seconds sometimes not even 1 second

lol, I am procrastinating at 11 at night... On RU-vid

Why can I manipulate myself to go to bed later and thus wake later but not the other way around? As of now my rythm has me get tired between 2 and 3AM and wake between 10 and 12. But that wake time seems to be fixed inside me now and I can only push it forward by forcing an alarm on myself that's strong enough to break my deep sleep that normally only can be ended by waking up itself. My sleep is so strong that someone could move me into a different room by carrying me and I wouldn't wake.

How did he record when he ate and slept if there were no clocks or sunlight?

Try to do this one . Your traped in a concrete box with a table inside how do you get out?

How would polyphasic sleep affect this telling of time?

me too

Interesting that the hormone vasopressin is released when it's mainly used as the male bonding hormone. I'm curious as to why

3:27 - Watching this at 12AM

can this Knowledge ,help to Cure insomnia or disturb regular sleep cycle ?????

time is relative... it's been theorized before by the e=mc^2 I recall...