- published: 23 Oct 2014
- views: 22411
A circadian rhythm /sɜːrˈkeɪdiən/ is any biological process that displays an endogenous, entrainable oscillation of about 24 hours. These 24-hour rhythms are driven by a circadian clock, and they have been widely observed in plants, animals, fungi, and cyanobacteria.
The term circadian comes from the Latin circa, meaning "around" (or "approximately"), and diēm, meaning "day". The formal study of biological temporal rhythms, such as daily, tidal, weekly, seasonal, and annual rhythms, is called chronobiology.
Although circadian rhythms are endogenous ("built-in", self-sustained), they are adjusted (entrained) to the local environment by external cues called zeitgebers (from German, "time giver"), which include light, temperature and redox cycles.
The earliest recorded account of a circadian process dates from the 4th century B.C.E., when Androsthenes, a ship captain serving under Alexander the Great, described diurnal leaf movements of the tamarind tree. The observation of a circadian or diurnal process in humans is mentioned in Chinese medical texts dated to around the 13th century, including the Noon and Midnight Manual and the Mnemonic Rhyme to Aid in the Selection of Acu-points According to the Diurnal Cycle, the Day of the Month and the Season of the Year.
Learn about the 4 main sleep stages and circadian rhythms. By Carole Yue. More free lessons at: http://www.khanacademy.org/video?v=fNlp0UMqUtM Visit us (http://www.khanacademy.org/science/healthcare-and-medicine) for health and medicine content or (http://www.khanacademy.org/science/mcat) for MCAT related content. These videos do not provide medical advice and are for informational purposes only. The videos are not intended to be a substitute for professional medical advice, diagnosis or treatment. Always seek the advice of a qualified health provider with any questions you may have regarding a medical condition. Never disregard professional medical advice or delay in seeking it because of something you have read or seen in any Khan Academy video.
◢ Using a complex pattern of binaural beat and isochronic tone frequencies dedicated to help you achieve good sleep and have lucid dreams, this 8-hour music track is divided into four unique sections. In the first 2 hours we've used frequencies that range from 3-13Hz (Alpha-Theta range) to help calm your mind and feel deeply relaxed. There is a pleasurable feeling of floating and it will give effects such as stress reduction, relaxed awareness, release of serotonin, and an induction to sleep spindles as your mind and body allows itself into sleep. It also contains triggers for creativity and imagery and access to subconscious images as you doze off. The second and third sections contain more of the Theta waves, which are also present in dreaming, sleep, deep meditation and creative inspi...
http://www.ted.com In today's world, balancing school, work, kids and more, most of us can only hope for the recommended eight hours of sleep. Examining the science behind our body's internal clock, Jessa Gamble reveals the surprising and substantial program of rest we should be observing. TEDTalks is a daily video podcast of the best talks and performances from the TED Conference, where the world's leading thinkers and doers give the talk of their lives in 18 minutes. Featured speakers have included Al Gore on climate change, Philippe Starck on design, Jill Bolte Taylor on observing her own stroke, Nicholas Negroponte on One Laptop per Child, Jane Goodall on chimpanzees, Bill Gates on malaria and mosquitoes, Pattie Maes on the "Sixth Sense" wearable tech, and "Lost" producer JJ Abrams ...
Jon Q takes a look at an app that'll help you improve your sleep as well as give you that oh so awesome feeling of well-restedness. Sleep cycle monitors and tracks your movements while you slumber to calculate the optimal time to wake you up. But does it actually work? Find out in this episode of WTA! What's The Apps is a in-depth application review experience hosted by Jon Quach - known on YouTube and the internet for his upbeat personality. Tune into TechnoBuffalo's What The Apps to find out what's hot and to learn how you can improve your mobile experience one app at a time.
Check out my other videos here: http://vid.io/xq7q MP3 version available here now: http://www.relaxmeonline.com/brainwave-entrainment-products/spiritualmetaphysical/ This track packs a powerful punch with both binaural beats and ischronic tones for a sleep with the good chance of lucid dreaming to boot! It kicks off at an Alpha level, moves into a Theta level, and finally settles on a deep delta level of 2.5 Hz. (Ideal for deep sleep) It has a drone like sound with nothing that will startle you to disturb the resting process. Headphones are recommended, although not an absolute requirement for this to work! My experience with lucid dreaming: http://relaxingme.com/2016/02/09/lucid-dreams-how-you-can-do-lucid-dreaming/ ~ I create positive affirmations and guided meditations to help you l...
◢ Get Blissful Sleep with this full 8-hour music therapy track that uses the brainwave entrainment frequencies that are associated with the Five Stages of Sleep. Feel recharged and well-rested upon waking. This track is divided into multiple parts, wherein each segment follows the brainwave sleep cycles. Stage 1 has 4-7Hz which will help you relax and fall asleep. Stage 2 uses 12-16Hz which makes the physical body in deep slumber. This is where some REM and sleep paralysis occurs. Sleep Paralysis is simply your mind being wide awake all of a sudden while your body is still asleep. Stage 3 is your overall deep sleep and uses 0.5-4Hz. This is the dreamless stage of sleep. Stage 4 is the deepest sleep stage, where your energy replenishes itself both physically and mentally. Stage 5 is where m...
Get the MP3 version: http://www.mindamend.com/yt/deep-sleep-sweet-melody ► Subscribe to my channel and be updated with my latest tracks: http://www.youtube.com/user/MindAmend?sub_confirmation=1 How this 8 hour sleep cycle track works This deep sleep music track has been embedded with brainwave entrainment tones and delta wave effects, which stimulate your brainwave activity and guides you gently through a typical 8 hour sleep cycle. Use it to help you get to sleep faster, and to keep you asleep during the night if you suffer from insomnia. In addition to the relaxing music soundtrack, this track also contains isochronic tones, and amplitude entrainment effects embedded into the music. Amplitude entrainment involves a process of distorting the sound to produce vibrations, which vibrat...
Are you over or under sleeping? Get Your Free Audiobook: http://bit.ly/XIcZpz WATCH 'How To Get Better Sleep' http://bit.ly/1l4c6k5 SUBSCRIBE: http://bit.ly/10kWnZ7 ---Links to follow us below!--- Instagram and Twitter: @whalewatchmeplz and @mitchellmoffit Clickable: http://bit.ly/16F1jeC and http://bit.ly/15J7ube Facebook: http://on.fb.me/1fjWszw Twitter: http://bit.ly/1d84R71 Tumblr: http://bit.ly/1amIPjF Vine: Search "AsapSCIENCE" on vine! Written and created by Mitchell Moffit (twitter @mitchellmoffit) and Gregory Brown (twitter @whalewatchmeplz). Further reading--- Electronic screen use and selected somatic symptoms in 10-12 year old children. http://www.ncbi.nlm.nih.gov/pubmed/25045838 The Transcriptional Repressor DEC2 Regulates Sleep Length in Mammals http://www.ncbi.nlm.nih...
An extra credit assignment I did for Psychology class depicting the different sleep stages.