With the rapid development of modern technology, people care more about material needs than spiritual. Therefore, health becomes the most important factor of our lives, and sleep plays a very important role in everyone’s health. People should lead a healthy lifestyle, especially, have a great sleep. Sleep is a naturally recurring state characterized by reduced or absent consciousness, relatively suspended sensory activity, and inactivity of nearly all voluntary muscles. It is distinguished from quiet wakefulness by a decreased ability to react to stimuli, and is more easily reversible than being in hibernation or a coma. Sleep is a heightened anabolic state, accentuating the growth and rejuvenation of the immune, nervous, skeletal and muscular systems. Sleep is a key part of a healthy lifestyle. Like eating right and exercising, sleeping well is essential to feeling your best during the day. It affects how you feel, your relationships, your productivity and your quality of life. While you sleep, your brain goes to work, consolidating the day’s learning into memory and reenergizing the body.
While we may not often think about why we sleep, most of us acknowledge at some level that sleep makes us feel better. We feel more alert, more energetic, happier, and better able to function following a good night of sleep. However, the fact that sleep makes us feel better and that going without sleep makes us feel worse only begins to explain why sleep might be necessary.
It may seem obvious that sleep is beneficial. Even without fully grasping what sleep does for us, we know that going without sleep for too long makes us feel terrible, and that getting a good night’s sleep can make us feel ready to take on the world. One way to think about the function of sleep is to compare it to another of our life-sustaining activities: eating. Hunger is a protective mechanism that has evolved to ensure that we consume the nutrients our bodies require to grow, repair tissues, and function properly. And although it is relatively easy to grasp the role that eating serves— given that it involves physically consuming the substances our bodies need—eating and sleeping are not as different as they might seem. Both eating and sleeping are regulated by powerful internal drives. Going without food produces the uncomfortable sensation of hunger, while going without sleep makes us feel overwhelmingly sleepy. And just as eating relieves hunger and ensures that we obtain the nutrients we need, sleeping relieves sleepiness and ensures that we obtain the sleep we need.
Sleep, learning, and memory are complex phenomena that are not entirely understood. However, animal and human studies suggest that the quantity and quality of sleep have a profound impact on learning and memory. Research suggests that sleep helps learning and memory in two distinct ways. First, a sleep-deprived person cannot focus attention optimally and therefore cannot learn efficiently. Second, sleep itself has a role in the consolidation of memory, which is essential for learning new information.
Sleep timing is controlled by the circadian clock, sleep-wake homeostasis, and in humans, within certain bounds, willed behavior. The circadian clock—an inner timekeeping, temperature-fluctuating, enzyme-controlling device—works in tandem with adenosine, a neurotransmitter that inhibits many of the bodily processes associated with wakefulness. Adenosine is created over the course of the day; high levels of adenosine lead to sleepiness. In diurnal animals, sleepiness occurs as the circadian element causes the release of the hormone melatonin and a gradual decrease in core body temperature. The timing is affected by one’s chronotype. It is the circadian rhythm that determines the ideal timing of a correctly structured and restorative sleep episode. Homeostatic sleep propensity must be balanced against the circadian element for satisfactory sleep.
Along with corresponding messages from the circadian clock, this tells the body it needs to sleep. Sleep offset is primarily determined by circadian rhythm. A person who regularly awakens at an early hour will generally not be able to sleep much later than his or her normal waking time, even if moderately sleep-deprived. College students are at a high risk for not getting an adequate amount of sleep. Varying class times, demanding work schedules, and busy social lives often mean that sleep is a low priority. However, sleep deprivation has many negative repercussions: it can contribute to memory problems and difficulty in logical reasoning, it can interrupt physiological processes related to hormone function and blood pressure, and it is associated with decreases in both efficiency and ability to concentrate.
Overall, as a college student, I need to have a healthy lifestyle which is both beneficial to my health and study. Therefore, I need to make enough sleep, at the same time, try to balance my schedule. Because, health is a premise, and only, healthy body can make everything possible.