男であれば友人らと「朝からビンビンだぜ」の類いの話を一度や二度はしたことがあるだろう。師走で忙しい時期に下世話な話で恐縮だが、今回はビンビンと睡眠の深い関係についての科学的なお話なのでお付き合いいただければ幸いである。 睡眠はレム睡眠とノンレム睡眠に分けられる(第16回「「夢はレム睡眠のときに見る」のウソ」 参照)。俗に、「ノンレム睡眠は脳の休息、レム睡眠は体の休息」のためにあるなどと言われるが、これは睡眠の役割を単純化しすぎである。本カラムでもこれまで何度も取り上げてきたように、睡眠とは単に体を横たえて休んでいる静の状態ではなく、記憶の固定、細胞の修復、免疫調節など生体内の各所で固有の活動が活発に、かつ同時並行で行われている。 大脳皮質が発達した霊長類や人間では深いノンレム睡眠が長いのが特徴で、睡眠中でもとりわけ深いノンレム睡眠中には脳活動が全般的に不活発になり、脳血流量や代謝量も低下す
Would your dog eat you if you died? Get the facts.You might not look at your fur baby the same way after reading this. Is this big black Newfoundland yawning—or contemplating its next meal? Cat owners often joke that their pets would eagerly eat them once they die. But forensic evidence suggests that dogs may pose a higher risk. In 1997, a forensic examiner in Berlin reported one of his more unusu
It is November 2, 1930, and National Geographic has sent a reporter and a photographer to cover a magnificent occasion: the crowning of Haile Selassie, King of Kings of Ethiopia, Conquering Lion of the Tribe of Judah. There are trumpets, incense, priests, spear-wielding warriors. The story runs 14,000 words, with 83 images. If a ceremony in 1930 honoring a black man had taken place in America, ins
For the first time, scientists are getting a view of the inner workings of ladybug wings. ➡ Subscribe: http://bit.ly/NatGeoSubscribe About National Geographic: National Geographic is the world's premium destination for science, exploration, and adventure. Through their world-class scientists, photographers, journalists, and filmmakers, Nat Geo gets you closer to the stories that matter and past t
Manuel Canales, NGM Staff; Patricia Healy. Art: Davide Bonadonna. Sources: Caleb Marshall Brown and Donald Henderson, Royal Tyrell Museum of Palaeontology; Jakob Vinther; C. R. Scotese, Paleomap Project On the afternoon of March 21, 2011, a heavy-equipment operator named Shawn Funk was carving his way through the earth, unaware that he would soon meet a dragon. That Monday had started like any oth
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