Sci Adv: Why do we sleep? Quantitative analysis reveals the functional transformation of sleep as you grow up!

A person sleeps about a third of his life, and for any animal, sleep is a necessary process for its survival.
studies have shown that animals suffer from a degree of neurological damage when they are awake, resulting in damaged genes and proteins that build up in the brain and cause disease, and sleep helps repair the damage and remove the trash.
also found that sleep promotes neuroplastic recombination and synapses associated with learning and memory consolidation.
it is not clear whether neuro repair and recombination play a relative role during sleep and whether it changes during individual development.
recently, a team of researchers from Imperial College, the University of California, and the University of Texas published a study in Science Advances entitled Unraveling why sleep: Quantitative analysiss reveals abrupt transition from neural reorganization to repair in Early development's research reveals changes in sleep during the development of the individual system, and finds that neuroplastic recombination occurs mainly in rapid eye movement sleep (REM), while the main function of sleep changes at about 2 and a half years of age, from neurorecombination and learning to functional repair and garbage removal.
researchers used data from more than 60 sleep studies, including humans and other mammals, to conduct the most comprehensive analysis of sleep statistics to date.
examined individual sleep data from birth to adulthood, including total sleep time, REM sleep time, brain size, weight, brain metabolic rate, body metabolic rate, and sleep metabolic rate (SMR), as well as individual development data, and established unique quantitative theory and mathematical models to analyze the link between synhap density, sleep time, brain size and brain metabolic rate, explaining how individual sleep changes with the brain and weight.
data analysis of different sleep time ratios in the early stages of development and later in development found that REM sleep decreases as the brain grows.
50 percent of newborns sleep reM, but by the age of 10 their share drops to about 25 percent and continues to decrease with age.
only 15 percent of reM sleep for adults over the age of 50.
reM sleep time began around the age of 2 and a half.
and when all species reach the age of about two and a half years, their REM sleep time begins to drop sharply, whether in mice, rabbits or pigs.
significant decrease in brain metabolism prior to functional transformation and the relationship between brain mass and age, also represents a significant change in sleep function.
study found that the main functions of sleep before the age of 2 and a half are brain building, nerve recombination and learning, and after 2 1 and a half years, the main function of sleep gradually translates into the maintenance and repair of the brain, i.e. the functional repair of neurological damage and the removal of waste such as metabolites.
brain repair in the late stages of the study was carried out during sleep.
for most adults, seven and a half hours of sleep a night is normal and needed, and babies and children need more than twice as much sleep, said study author Gina Poe, who studies the transition from recombination to repair.
long-term lack of sleep can lead to health problems such as dementia, diabetes and obesity, and a good night's sleep is a free medicine.
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