Sleep: A mystery at the crossroads of neuroscience (Part 2)

By Deepak Chopra, M.D., FACP, P. Murali Doraiswamy, MBBS, FRCP, Professor of Psychiatry, Duke University Medical Center, Durham, North Carolina

 

In the last post we saw how essential sleep is for the physiological needs of  almost all animals, but sleep would seem to be a poor survival trait as far as evolution goes.  Because sleep put our ancestors (and other living creatures) at risk from predators, the benefits must outweigh the risks –that’s all that scientists can manage to agree on. Unlike humans, some animals (e.g., newborn dolphins) can survive sleep deprivation for a couple of weeks without apparent harm.  However, in most species, after extended sleep deprivation their body temperature and metabolism becomes unstable and they die.  The longest period a human has survived sleep deprivation is believed to be about two weeks, but many physical and mental deficits occur long before that; driving ability is significantly impaired after one night’s bad sleep. (more…)

Sleep: A mystery at the crossroads of neuroscience (Part 1)

By Deepak Chopra, M.D., FACP, P. Murali Doraiswamy, MBBS, FRCP, Professor of Psychiatry, Duke University Medical Center, Durham, North Carolina

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Sleep crops up in unexpected places medically, as in the recent finding that for people suffering from bouts of depression, irregular sleep is often the first sign of an attack, and conversely, getting a good night’s sleep can help prevent the onset of depression. But the importance of sleep has become more global in recent years, involving it in obesity, for example, where bad sleep throws off the hormonal balance that tells the body when it’s hungry. (more…)