Sleep Is Overrated - NOT! Why Us Mere Humans Need To Snooze

Sleep Sleep is very important to humans. Mammals, reptiles, and birds also have to sleep.

Studies have shown that people can live longer without food than they can without sleep.

Why Do We Sleep

Although the accurate reasons for sleep remain a mystery, we do know that during sleep many of the body’s major organ and regulatory systems continue to work actively.

Some scientists have proposed that without any biological foundation we may sleep out of mere habit. Sleep may be a time for the brain to recharge. The brain shuts down and repairs neurons and exercises synapses that may slowly break down and weaken with a lack of activity during sleep.

This could be a time for fine tuning the synaptic connections that get stronger, weaken, break and reform. Sleep, it is theorized, is a time to shift those synaptic connections back to their original design after they have been jumbled up during the day.

Some parts of the brain actually raise their activity dramatically, and the body produces more of certain hormones. No one knows exactly why we sleep but several scientific theories have been proposed.

Knowledge can give you a real advantage. To make sure you’re fully informed about reasons for sleep, keep reading. Sleep gives the brain a possibility to reorganize information to find answers to problems, to process new information, and to organize and archive memories.

The brain reinforces memory and categorizes everything learned in a specific order, and erases the useless, insolent information. Metabolism slows down as well as energy consumption during sleep.

Sleep gives the body a chance to replace chemicals and repair muscles, other tissues and aging or dead cells. It may also have an effect on strengthening the immune system.

Sleep may also be a time for rest for our heart and lungs. People with normal or high blood pressure have a 20-30% reduction in pressure and a 10-20% heart rate reduction.

In Children And Young Adults

Growth hormone is released during sleep in children and young adults. Circadian rhythm or a day-night cycle of about 24 hours has a large impact on the timing, amount, and quality of sleep. A stable circadian rhythm means better sleep.

Adult humans need 7-8 hours of sleep per night. Brain glycogen levels are replenished during sleep. The brain is able to filter events that do and do not have an impact on long-term memory when humans sleep. Sleep is necessary for survival in mammals.

For instance, rats will die after about two weeks without sleep. After significant weight loss, they will not be able to control their body temperature and will build up infections.

A lack of sleep in humans leads to impaired memory and decreased cognitive capabilities, mood swings, and hallucinations. [Hypnagogic Hallucinations]

Some experts have speculated that sleep may be an evolutionary instrument to conserve energy. Still others say sleep may give the brain an opportunity to process experiences or even to exercise neural pathways that have lain dormant during the day.

Sleep has a healing effect in that it gives our bodies and minds time to rejuvenate, reenergize, and restore. We organize long-term memory, integrate new information, and repair and renew tissue, nerve cells and other chemicals.

Sleep is also of an adaptive nature. As primitive humans and mammals, it was and is easier to find food during the day and, for mammals, to hide at night.

Sleep may reinstate some chemical that is drained during periods of wakefulness. Scientists have isolated chemicals that vary during sleep, like adenosine, which affects metabolism and fatigue — but no one has pinned down a definitive chemical explanation for sleep.

Sleep is also a matter of energy conservation. Humans are conserving energy when it would be unlikely to find food if we stayed awake during sleep. A hormonal body clock also regulates sleep patterns.

The melatonin in the body rises during evening hours which makes us sleepy. Morning brings a drop in melatonin concentration.

Light also helps us stay awake. When human eyes get strong light waves, the melatonin production is depressed via links with our visual system. The amount and quality of sleep we get is directly related to the amount and quality of our productivity.