From Pop Sci.com (Dec. 15, 2024):
Everyone has heard that it’s vital to get seven to nine hours of sleep a night, a recommendation repeated so often it has become gospel. Get anything less, and you are more likely to suffer from poor health in the short and long term — memory problems, metabolic issues, depression, dementia, heart disease, a weakened immune system.
But in recent years, scientists have discovered a rare breed who consistently get little shut-eye and are no worse for wear.
Natural short sleepers, as they are called, are genetically wired to need only four to six hours of sleep a night. These outliers suggest that quality, not quantity, is what matters. If scientists could figure out what these people do differently it might, they hope, provide insight into sleep’s very nature.
“The bottom line is, we don’t understand what sleep is, let alone what it’s for. That’s pretty incredible, given that the average person sleeps a third of their lives,” says Louis Ptáček, a neurologist at the University of California San Francisco.
Scientists once thought sleep was little more than a period of rest, like powering down a computer in preparation for the next day’s work. Thomas Edison called sleep a waste of time — “a heritage from our cave days” — and claimed to never sleep more than four hours a night. His invention of the incandescent lightbulb encouraged shorter sleep times in others. Today, a historically high number of US adults are sleeping less than five hours a night.
But modern sleep research has shown that sleep is an active, complicated process we don’t necessarily want to cut short. During sleep, scientists suspect that our bodies and brains are replenishing energy stores, flushing waste and toxins, pruning synapses and consolidating memories. As a result, chronic sleep deprivation can have serious health consequences.
Most of what we know about sleep and sleep deprivation stems from a model proposed in the 1970s by a Hungarian-Swiss researcher named Alexander Borbély. His two-process model of sleep describes how separate systems — circadian rhythm and sleep homeostasis — interact to govern when and how long we sleep. The circadian clock dictates the 24-hour cycle of sleep and wakefulness, guided by external cues like light and darkness. Sleep homeostasis, on the other hand, is driven by internal pressure that builds while you’re awake and decreases while you’re asleep, ebbing and flowing like hunger. [read more]
May explain President Trump.
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