Herbie Murray
Sleep is a necessity for all humans, but the biological purpose of sleep remains a mystery. Sleep affects almost every type of tissue and system in the body, from the brain, heart, and lungs to metabolism, immune function, mood, and disease resistance. Theories suggest that sleep allowed early humans to avoid predators, conserve energy, and meet their need for rest. Another theory, called the restorative theory, states that the body needs sleep to restore itself.
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What You'll Learn
Sleep helps humans avoid predators
The timing of sleep is correct when two circadian markers occur after the middle of the sleep episode and before awakening: the maximum concentration of the hormone melatonin and the minimum core body temperature. Human sleep needs vary by age and among individuals. Sleep is considered adequate when there is no daytime sleepiness or dysfunction. Research suggests that eight hours of sleep for human beings can produce a daily energy saving of 35% per 24-hour cycle.
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Sleep restores the body
The biological patterns that help humans live according to the 24-hour day-night cycle are called circadian rhythms. These work alongside the sleep drive, which is the desire to sleep that grows in intensity the longer a person has been awake. Circadian rhythms cause people to feel sleepy at night and alert in the morning.
Sleep affects almost every type of tissue and system in the body, from the brain, heart, and lungs to metabolism, immune function, mood, and disease resistance. The timing of sleep is correct when two circadian markers occur after the middle of the sleep episode and before awakening: the maximum concentration of the hormone melatonin, and the minimum core body temperature.
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Sleep affects the immune system
Sleep affects almost every type of tissue and system in the body, including the immune system. Research suggests that eight hours of sleep can produce a daily energy saving of 35% per 24-hour cycle. This is important for the immune system, as it allows the body to conserve energy and meet its need for rest.
The restorative theory states that the body needs sleep to restore itself. Sleep is considered to be adequate when there is no daytime sleepiness or dysfunction. This is regulated by the body's circadian rhythms, which work alongside the sleep drive to cause people to feel sleepy at night and alert in the morning.
The timing of sleep is also important, with the hormone melatonin and core body temperature playing a role. When the body has the correct amount of sleep, the immune system can function optimally.
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Sleep is linked to the 24-hour day-night cycle
Human beings evolved to survive and thrive on a planet with a 24-hour cycle of day and night. Sleeping in one consolidated block at night allowed early humans to avoid predators, conserve energy, and meet their need for rest. It also kept them from having to adapt to life in two very different conditions: daylight and darkness. The biological patterns that help humans live according to the 24-hour day-night cycle are called circadian rhythms. These rhythms work alongside the sleep drive, which is a desire to sleep that grows in intensity the longer a person has been awake. Circadian rhythms cause people to feel sleepy at night and alert in the morning.
The timing of sleep is correct when two circadian markers occur after the middle of the sleep episode and before awakening: the maximum concentration of the hormone melatonin, and the minimum core body temperature. Research suggests that eight hours of sleep for human beings can produce a daily energy saving of 35% per 24-hour cycle.
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Sleep needs vary by age
Human sleep needs vary by age and among individuals. Sleep is considered adequate when there is no daytime sleepiness or dysfunction.
For example, the amount of sleep a newborn needs differs from that of a teenager or an adult. Newborns sleep for about 16 to 18 hours a day, while teenagers need about 9 to 10 hours of sleep per night. Adults, on the other hand, typically require 7 to 9 hours of sleep per night for optimal functioning.
Several factors influence sleep needs across different ages. One factor is the development and maturation of the brain. During infancy and early childhood, the brain undergoes rapid growth and development, requiring more sleep to support these processes. As individuals age, their sleep patterns and needs may change due to various factors, including lifestyle, health conditions, and environmental factors.
Additionally, older adults may experience changes in their sleep architecture, which refers to the structure and sequence of sleep stages. They may spend less time in deep, restorative sleep and more time in lighter sleep stages. This can result in shorter sleep durations or increased sleep fragmentation, leading to daytime napping or longer sleep durations at night.
It's important to note that sleep needs can also vary within the same age group. Some individuals may naturally require more or less sleep than others, and this variation is influenced by genetic factors and individual differences in sleep drive and circadian rhythms.
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Frequently asked questions
Sleep is essential for human survival and evolution. It helps us conserve energy, restore our bodies, and avoid predators.
The biological purpose of sleep remains a mystery, but it is known to affect almost every type of tissue and system in the body, including the brain, heart, lungs, metabolism, immune function, mood, and disease resistance.
Research suggests that eight hours of sleep can produce a daily energy saving of 35% per 24-hour cycle due to a drop in metabolic rate.
The restorative theory suggests that the body needs sleep to restore and repair itself.
The timing of sleep is regulated by our circadian rhythms, which work with our sleep drive to make us feel sleepy at night and alert in the morning.
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