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  1. About this book
  2. Manual Pleasure Spikes - Lesbian BDSM Erotica
  3. The Science of Sleep: Understanding What Happens When You Sleep
  4. The Science of Sleep: Understanding What Happens When You Sleep | Johns Hopkins Medicine

Chronic insomnia has also been linked to increased risk of developing a mood disorder, including anxiety or depression. Another study found that after a week of getting just four-and-a-half hours of sleep per night, individuals reported worse moods in terms of feeling stressed, angry, sad or mentally exhausted.

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And at the same time, other systems in the body ramp way up during sleep. Sleep is also when our muscles repair damage and regular wear and tear from throughout the day.

About this book

Research suggests that the body produces fewer infection-fighting antibodies when sleep deprived. And thanks to all these important roles that sleep plays in the body, chronically getting poor sleep can have some pretty serious consequences.

Cutting sleep short by even just two to three hours a night over time has been linked to an increased risk of obesity, diabetes, cardiovascular disease, hypertension and premature death. Part of this has to do with the fact that insulin sensitivity fluctuates during the day — meaning our bodies actually metabolize food differently at different times of the day, she says. When it comes to staying healthy, people pay a lot of attention to nutrition and physical activity, Bazil says — which are both very important.

Want more tips like these? In the human brain, the images that the eyes receive are interpreted and used to form an impression of the world around us. The visual cortex, the part of the brain that interprets sight, actually receives images upside down from both eyes, so it not only has to merge the pictures into a cohesive whole, but it also has to flip them right side up.

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Obviously, the main organ that works with the eyes is the brain, specifically the visual cortex that interprets what it is that the eye is seeing. However, there are a number of organ systems that also work with the eye. The muscular system is connected to the eye since it's muscle tissue that allows the eye to turn and rotate in its socket. The nervous system is also linked to the eye in that the optic nerve transmits the impressions from the eye to the brain.

The Science of Sleep: Understanding What Happens When You Sleep

Circadian rhythms are controlled by a biological clock located in the brain. One key function of this clock is responding to light cues, ramping up production of the hormone melatonin at night, then switching it off when it senses light. People with total blindness often have trouble sleeping because they are unable to detect and respond to these light cues. Sleep drive also plays a key role: Your body craves sleep, much like it hungers for food.

The Science of Sleep: Understanding What Happens When You Sleep | Johns Hopkins Medicine

Throughout the day, your desire for sleep builds, and when it reaches a certain point, you need to sleep. Researchers also believe that sleep may promote the removal of waste products from brain cells—something that seems to occur less efficiently when the brain is awake.

Why Your Body Is AMAZING!

Sleep is vital to the rest of the body too. Symptoms of depression, seizures, high blood pressure and migraines worsen.