It’s quite obvious that not getting enough sleep makes us irritable and disturbs our concentration levels. But, there are a lot more important reasons than a being irritable that makes sleep an important lifestyle factor.
Sleep is vital for good health and well being. Adequate sleep helps regulate your appetite leading to better weight management, which a key to preventing many chronic diseases, such as diabetes and heart disease.
What Is Sleep?
Sleep is a time when your body recovers or rejuvenates itself, undergoing processes to restore cells, process information, and improve health.
Circadian rhythm
Much like the daily opening and closing of tamarind tree leaves, the human body follows a natural, (approximately) 24-hour pattern called the circadian rhythm. This rhythm is influenced by the environment (such as lightness or darkness) as well as your genetic makeup and determines your sleep patterns by releasing hormones when it’s time to sleep. Abnormalities in the circadian rhythm can lead to sleep disorders like insomnia.
Stages of sleep
Sleep has two main phases—REM and non-REM. We spend about a quarter of our sleeping lives in the REM phase, which is a period of vigorous brain activity, marked by vivid dreams. This stage may be responsible for consolidating information and processing memories, which is why babies (whose entire days are full of new experiences the brain needs to process) spend twice as much time in REM sleep than adults do.
Non-REM sleep has three to four distinct stages (depending on which experts you ask). These grow gradually deeper throughout the night until it becomes very difficult to be disturbed from sleep. During this time, the body works to gently lower the heart rate, temperature, and breathing rate.
The purpose of sleep
- Offers the body a chance to recover from wear and tear of daily life. Many researchers have suggested the restorative effects of sleeping. This doesn’t just mean that the body rests during sleep—rather, the cells busily regenerate themselves and the body temperature, heart rate, and breathing drop in order to conserve energy.
- Facilitates learning & memory. Not only do you need rest to sustain the attention and concentration necessary to learn new tasks, but according to Harvard’s Division of Sleep Medicine, sleep is a time for the brain to consolidate memories, which makes learning new things easier. People who sleep after learning how to play a video game generally perform much better in the game later than those who stay awake.
- Plays a role in immune function. Your body produces special proteins called cytokines, which help your immune system fight off infection. According to the U.S. Department of Health and Human Services, more of these proteins are produced during sleep when you are sick, which is one of the reasons you may feel so tired when you have the flu. Rest gives the body the time it needs to produce these infection-fighting proteins and to restore itself to wellness.
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REFERENCES
http://www.takingcharge.csh.umn.edu/wellbeing/health/sleep
#Thinkhealth blog 