No single person "created" sleep; it's a fundamental, ancient biological process that evolved over millions of years in animals, serving crucial functions like brain cleansing and energy restoration, although different cultures have attributed its origin to various deities or viewed it as a sign of a Creator. From a scientific perspective, sleep is a vital function that arose through natural selection, with specific brain regions and genetics controlling its cycles.
The first documented observations of sleeping began to emerge in approximately 450BC. It was during this time that Alcmaeon, an ancient Greek physician, suggested that sleep may be a period of unconsciousness brought on by a lack of blood circulating from the heart to the brain.
Leonardo da Vinci
He followed a polyphasic sleep pattern with a 20-minute nap every four hours. Given his expertise in so many things -- invention, painting, sculpting, architecture, science, music and more – the unconventional schedule must have worked for him.
In September 1953, as a result of work in his laboratory, Kleitman and one of his students, the late Eugene Aserinsky, reported the discovery of rapid eye movements (REMs) during sleep and suggested the association of these eye movements with dreaming.
Sleep is a highly conserved behavior across animal evolution, likely going back hundreds of millions of years, and originating as a means for the brain to cleanse itself of waste products. In a major breakthrough, researchers have found that cleansing, including the removal of amyloid, may be a core purpose of sleep.
The koala is famous for sleeping around 20-22 hours a day, which is about 90% of the day, due to their low-energy diet of eucalyptus leaves that requires extensive digestion. Other extremely sleepy animals include the sloth (up to 20 hours) and the brown bat (around 20 hours), with some snakes like the ball python also sleeping up to 23 hours daily.
It's common knowledge that sleep is good for your brain – and Einstein took this advice more seriously than most. He reportedly slept for at least 10 hours per day – nearly one and a half times as much as the average American today (6.8 hours). But can you really slumber your way to a sharper mind?
The Social Transformation of Nighttime
For much of recorded history, humans have actually slept eight hours, but in two distinct phases of approximately four hours each.
William Dement, the "father of sleep medicine," elucidated the phases of the human sleep cycle and identified the physiological basis of dreams.
Because energy expenditure is decreased by inactivity, including during hibernation,33 estivation (ie, extended periods of dormancy during a hot or dry period), and sleep, these states increase evolutionary fitness.
Musk goes to bed around 3 a.m. and gets about 6 hours of sleep every night. Although he's not getting eight hours a night, Musk has upped his sleeping schedule from being nearly nonexistent in the past. In May 2023, Musk told CNBC that he's no longer pulling all-nighters.
The 3-2-1 bedtime method is a simple sleep hygiene strategy: stop eating 3 hours before bed, stop working 2 hours before bed, and stop using screens (phones, tablets, TVs) 1 hour before sleep, helping your body transition to rest by reducing stimulants and digestive load for better sleep quality. A more detailed version adds 10 hours (no caffeine) and 0 (no snoozing) for a 10-3-2-1-0 rule.
Einstein was famous for taking regular naps and sleeping at least 10 hours at night. He had a particularly peculiar napping system. He would settle in his chair with a spoon in his hand while placing a metal plate on the floor.
According to Psalm 115:3, “Our God is in heaven; he does whatever pleases him.” This is true not only across the pages of time and history, but it was especially true at the very beginning of everything. God solely caused Adam to rest so that His might could be displayed and He could do just as He pleased.
For most of human history, a continuous eight-hour snooze was not the norm. Instead, people commonly slept in two shifts each night, often called a "first sleep" and "second sleep."
Thomas Edison: The famous inventor only required about three to four hours of shut eye each night, according to The New York Times. He regarded sleep as "a heritage from our cave days." Benjamin Franklin: In his autobiography, Franklin published his typical daily schedule.
Sleep plays a vital role in good health and well-being throughout your life. The way you feel while you are awake depends in part on what happens while you are sleeping. During sleep, your body is working to support healthy brain function and maintain your physical health.
Like many sufferers, Shaq was unaware that he had sleep apnea until his partner told him about his pattern of snoring and gasping for breath. After completing a sleep study and being diagnosed with moderate sleep apnea, Shaq was fitted with a CPAP mask to get a better night's rest.
Einstein slept nearly 10 hours a day. He valued the significance of quality sleep for maintaining his well-being. His sleep routine, though, was out of the ordinary. He regularly indulged in brief daytime naps, occasionally more than once a day.
“In 'normal' circumstances — in the absence of a circadian rhythm or sleep abnormalities/disorders and without significant sleep deprivation — [the forbidden zone for sleep] is going to begin around 7 p.m.,” says Dr. Goldstein.
We often perceive sleeping during the day as a sign of laziness, but should we? – After all, there is extensive research showing that an afternoon nap is perfectly natural for humans. At the same time, there is solid evidence that sleep deprivation leads to lessened productivity.
Because they are high achievers, they're often able to take on more than most. Even so, they eventually find their breaking point, and must start looking for a new solution to the problem of their limited time. Rather than scaling back commitments, high achievers double down and work even harder by sacrificing sleep.
The 30th president of the United States would often sleep up to 11 hours a day, including his two-to-four-hour afternoon naps.
Tesla also only slept two hours per day but in an arcane manner. He said, “When I sleep, I sleep profoundly. To sleep deeply, profoundly, is an art like deep breathing that must be learned.