Seonglae Cho건강에 가장 중요한 건 수면, 두번째는 식이이다. Diet
잠을 오게 하는 호르몬인 멜라토닌은 밤이 길어질수록 분비되는 시간이 길어진다
밤이 긴 겨울에는 멜라토닌이 아침 늦게까지 남아있어 늦잠을 자게 되는 것
Sleep Notion
Sleep Usages
Memory
Zapping the brain during sleep helps memories form
"We basically enhanced this highway by which information flows."
https://www.freethink.com/health/memory-consolidation-brain-stimulation
Slow-wave sleep
Slow-wave sleep ( SWS), often referred to as deep sleep, consists of stage three of non-rapid eye movement sleep. Initially, SWS consisted of both Stage 3, which has 20-50 percent delta wave activity, and Stage 4, which has more than 50 percent delta wave activity.
https://en.wikipedia.org/wiki/Slow-wave_sleep
Sleep Evolved Before Brains. Hydras Are Living Proof. | Quanta Magazine
The hydra is a simple creature. Less than half an inch long, its tubular body has a foot at one end and a mouth at the other. The foot clings to a surface underwater - a plant or a rock, perhaps - and the mouth, ringed with tentacles, ensnares passing water fleas.
https://www.quantamagazine.org/sleep-evolved-before-brains-hydras-are-living-proof-20210518/?utm_source=tldrnewsletter
"매일 늦잠, 게으른 사람일까? 유전일까?"
알람을 여러 개 맞춰놔도 일어나기가 쉽지 않다. 결국 늦잠을 자 헐레벌떡 이불 밖을 나오게 된다. 늦잠이 많은 사람은 특히 힘들다. 왜 그럴까? 왜 늦잠을 자게 되는 걸까? 우리 몸에는 시계 역할을 하는 유전자가 있다. 이 유전자들은 잠이 들고 깨는 시기, 필요한 수면의 양 등을 결정한다. 초파리에서는 per, tim, 클락(clock), cyc 유전자가 그 역할을 한다.
https://n.news.naver.com/mnews/article/016/0001871752?sid=105
During sleep, slow electrical waves push fluid from around cells deep in the brain to its surface, where it is absorbed into the bloodstream through a sophisticated interface. There is growing evidence that the brain's waste-removal system is impaired in Alzheimer's disease.
The brain makes a lot of waste. Now scientists think they know where it goes
The brain appears to rely on synchronized waves to wash out waste products, including toxins associated with Alzheimer's disease.
https://www.npr.org/sections/shots-health-news/2024/06/26/g-s1-6177/brain-waste-removal-system-amyloid-alzheimer-toxins
Dreams are not meaningless byproducts, but rather evolved to prevent Overfitting in the brain and aid generalization. Just as deep learning uses noise injection and Dropout to prevent overfitting, dreams provide the brain with distorted, sparse, and hallucinatory inputs: the sparsity, hallucination, and narrative that differ from reality are precisely the "intentional corruption" that favors generalization.
In other words, dreams expose the brain to high-entropy data that differs from existing data, preventing overfitting Model Collapse. This means the brain continuously generates its own Synthetic Dataset for self-training, thereby generalizing its performance
This explains the phenomenology of dreams (their strangeness) better than Memory Consolidation or emotional regulation theories. Sleep (especially dream) deprivation → memorization remains intact but ability to respond to new situations declines. Dreams contribute to performance recovery after repeated overtraining. Fiction like novels and films can also help generalization like "artificial dreams"