Sleeping mask

Why do we sleep?

The purpose of sleep is still largely unknown.

However, it is commonly acknowledged that there is more than one reason why humans need to sleep. It’s probably required for a variety of biological reasons.

Sleeping passenger

Scientists have discovered that sleep benefits the body in a variety of ways.

The most popular theories and justifications are listed below.

Energy conservation

Low battery symbol drawn on human hand, living energy concept

We require sleep to conserve energy, according to the energy conservation theory. Sleeping allows us to lessen our caloric needs by allowing us to operate on a slower metabolism for a portion of the day.

Cellular restoration

Another hypothesis, known as the restorative theory, claims that the body requires sleep to heal.

attractive healer putting hands above body of handsome man on massage table

Sleep is thought to allow cells to repair and regenerate. Many key activities that occur during sleep assist this, including muscle repair, protein synthesis, tissue growth, and hormone release.

Brain function

According to the brain plasticity idea, sleep is necessary for brain function. It permits your neurons, or nerve cells, to restructure specifically.

wooden puzzle with brain icons and their functions. The concept of innovation

Many elements of brain function are affected by sleep, including learning, memory, problem-solving skills, and creativity.

Emotional well-being

Collage of negative emotions

Sleep is also crucial for emotional well-being. Brain activity in areas that regulate emotion rises during sleep, promoting optimal brain function and emotional stability.

The amygdala, striatum, hippocampus, insula, and medial prefrontal cortex are all areas of the brain where sleep enhances activity.

Weight maintenance

close up of feet on a weight scale looking how much is her weight and if she has losed weight

Sleep influences weight through regulating hunger hormones. Ghrelin, which promotes hunger, and leptin, which improves the feeling of being full after eating, are two of these hormones.

Closeup of obese woman measuring her big belly with yellow measuring tape. Concept of dieting

According to recent studies, chronic sleep deprivation, even as little as five nights of interrupted sleep, is linked to an increased risk of obesity, metabolic syndrome, type 2 diabetes, and depression.

Insulin function is optimal.

close up of glucometer, insulin pen and drug pills

Insulin is a hormone that aids the utilization of glucose (sugar) by your cells. Insulin resistance, on the other hand, occurs when your cells do not respond to insulin adequately.

Arterial blood pressure checking concept

High blood glucose levels and, eventually, type 2 diabetes can result from this.


a torn paper written with inscription immunity on a violet background

Sleep is essential for a healthy and powerful immune system. Sleep deprivation has been shown to suppress the immune system and make the body more susceptible to infections, according to research.

Heart health

Human Heart! Heart Health! Organ Donor!

While the exact causes are unknown, scientists believe that sleep is beneficial to heart health.

This is due to the association between poor sleep and heart disease.


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