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Matthew Walker

  • Puspita Dewi Fortunafez uma citaçãohá 2 anos
    Every species in which we can measure sleep stages experiences NREM sleep—the non-dreaming stage
  • Puspita Dewi Fortunafez uma citaçãohá 2 anos
    REM sleep was more efficient at accomplishing
  • Puspita Dewi Fortunafez uma citaçãohá 2 anos
    when an organism enters REM sleep, the brain paralyzes the body, turning it limp and immobile.
  • Puspita Dewi Fortunafez uma citaçãohá 2 anos
    when an organism enters REM sleep, the brain paralyzes the body, turning it limp and immobile. Swimming is vital for aquatic mammals, since they must surface to breathe. If full paralysis was to take hold during sleep, they could not swim and would drown.
  • Puspita Dewi Fortunafez uma citaçãohá 2 anos
    That humans (and all other species) can never “sleep back” that which we have previously lost is one of the most important take-homes of this book, the saddening consequences of which I will describe in chapters 7 and 8.
  • Puspita Dewi Fortunafez uma citaçãohá 2 anos
    Their sleep, of which there is only NREM, can be unihemispheric, meaning they will sleep with half a brain at a time!
  • Puspita Dewi Fortunafez uma citaçãohá 2 anos
    Of course, both halves of the dolphin brain can be, and frequently are, awake at the very same time, operating in unison. But when it is time for sleep, the two sides of the brain can uncouple and operate independently, one side remaining awake while the other side snoozes away
  • Puspita Dewi Fortunafez uma citaçãohá 2 anos
    The flock will first line up in a row. With the exception of the birds at each end of the line, the rest of the group will allow both halves of the brain to indulge in sleep. Those at the far left and right ends of the row aren’t so lucky. They will enter deep sleep with just one half of the brain (opposing in each), leaving the corresponding left and right eye of each bird wide open. In doing so, they provide full panoramic threat detection for the entire group, maximizing the total number of brain halves that can sleep within the flock. At some point, the two end-guards will stand up, rotate 180 degrees, and sit back down, allowing the other side of their respective brains to enter deep sleep.
  • Puspita Dewi Fortunafez uma citaçãohá 2 anos
    Individuals who are deliberately fasting will sleep less as the brain is tricked into thinking that food has suddenly become scarce.
  • Puspita Dewi Fortunafez uma citaçãohá 2 anos
    Female killer whales give birth to a single calf once every three to eight years.
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