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Sleep-Wake Cycle
The sleep-wake cycle is controlled by two systems, circadian and homeostatic system, that work against each other (Marhefka, 2011). The circadian system, also known as the internal clock, is responsible for regulating sleep/wake cycles as well as hormonal secretions. The homeostatic system controls how sleepy you are by increasing the need for sleep as the period of wakefulness lengthens (Alhola, Polo-Kantola, 2007). Physiologically, the circadian preferences for adolescents and young adults tend to be delayed. As adolescents become more physically mature, they usually have a lower homeostatic sleep drive, thus making them less sleepy at night (Thacher, 2008). The typical circadian period of adolescents and college students is 24.27, while older adults have a circadian period of 24.1 hours (Hershner, Chervin, 2014). Having delayed circadian
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In stage one, a sleeper experiences light sleep and can easily be awaken. When a sleeper progresses to stage two, eye movement stops and brain waves become slower (National Sleep Foundation, 2015). Stages three and four are both regarded as the deepest and most restorative sleep, with no eye movement or muscle activity occurring during this stage (Stages of sleep, 2014). During these stages, blood supply to muscle increases and tissue growth and repair occurs. On average, REM sleep occurs every 90-120 minutes, approximately 4 to five times a night if adequate amount of sleep is obtained. Each REM sleep period grows progressively longer than the previous cycle, with the last episode near rise time (Hershner, Chervin, 2014). REM sleep is essential because it provides energy to the brain and the body, thus supporting daytime performance. In order for sleepers to receive the full benefit that sleeping provides, they must go through each sleep stage for an extended period of time (Stages of sleep,
It is true that sleep deprivation is a widespread issue, generally resulting from early start times. It is also a serious one; according to a study by Harvard Medical School, sleep deprivation can lead to issues such as obesity, heart disease, difficulty learning, and can genuinely shorten a person’s lifespan. As Robbins explains, teenagers have a different internal sleep clock than other age groups. It is most healthy for students in high school to go to bed around 11 and wake up around 9. Since school often begins as early as 7, students are told they simply need to go to bed early, around 8 or 9 PM. This contention does not take into account the fact that humans are biologically not wired this way, and it's virtually impossible for most teens to fall asleep this early. It also doesn't take into account that with clubs, sports, church, volunteering, other extracurriculars and hours of homework, students often struggle to start their homework before their suggested “bedtime”. It is contended that students can control their own schedules so that they can get more sleep. However, pressure from parents and peers to get into a “good” college can cloud students’ perceptions of what is right for them, making them choose to overwork themselves in order to build impressive resumes. I myself can identify with this phenomenon. During the weekdays alone, I volunteer two nights a
According to the National Sleep Foundation, biological sleep patterns change throughout the stages of adolescence. ¨Biological sleep patterns shift toward later times for both sleeping and waking during adolescence-meaning it is natural to not be able to fall asleep before 11:00pm.¨ (¨Teens and Sleep¨). Messing with these sleep cycles in the long run and lead to sleep disorders. Research done by the Centers for Disease Control and Prevention suggests teenagers 13-18 years old should regularly sleep 8-10 hours each night for a healthy sleep. The teens who do not get a good amount of sleep are more likely to suffer from mental conditions, smoking, illicit drugs, and alcohol use. ¨Not getting enough sleep is common among high school students and is associated with several health risks including being overweight, drinking alcohol, smoking tobacco, and using drugs, as well as poor academic performance.¨ (¨Schools Start Too Early¨). On an NBC news story, Hilton Head Island High School moved its start time and benefits were noticeable. Students had higher test score averages and grades improved throughout the school.A study done in 2008 published in the journal of clinical sleep, found car accident rates fell by 16.5% when students were more aware on the road, not having to wake up before 7 am.
The Sleep Cycle: There are five stages of sleep. Stage one is where we start to drift off to sleep.
So for an average sleep time of eight to ten hours, we go through this sleep cycle four to five times a night. In stage one of the sleep phases, we are in a light sleep that lasts anywhere from five to ten minutes. In this stage, our eyes are still moving slowly and our muscles are slowing down, but may still have sudden muscle contractions like as if we were being startled or as if we were falling down. People in this phase may not feel rested if they are awakened, and might not of felt like they were even asleep at all. In stage two of the sleep cycle, you have successfully fallen into a light sleep. During this cycle your heart rate has slowed down, and your body temperature has dropped. You no longer have eye movement, and your body is finally resting the parts it has used through out the day. The next stage, which is stage three is also combined with stage four of the sleep cycle. These two cycles together are known as the delta sleep or the deep sleep stage, and is a very important part of the sleep cycle. During these cycles your body repairs and re-grows tissue, strengthens the immune system and builds bone and muscle. In these cycle it may be very hard to wake a person up, and if woken they may feel droggy or “out of it” for several minutes. In these stages is when most people have night terrors, experience sleep walking, or sleep talking occurs. In an adults average time of sleep this takes up about fifteen to twenty five percent of the time of sleep. Lastly, there is the REM cycle, which is also known as paradoxical sleep. During this cycle is when most of your muscles are paralyzed, your eyes are moving rapidly, and your breathing, heart rate and body temperature are not regulated. Vital signs show that during this stage, the arousal and oxygen levels
While points, claims, and statistics may be found within all of the sources used for the research, the sheer amount of referenced studies and works within the “Sleep-Wake” paper lends weight to it’s usefulness as a reliable source. One of the otherfactor of sleep and its affect within the college community. Three sources varying in criteria and usefulness were found that related to this subject and were studied. sources, “College Students try to Cheat Sleep Needs”, a college newspaper, offers basic facts and elementary assumptions such that could be found within any biology textbook or encyclopedia. These references are to such things as sleep cycles and sub stages and the general consequences of an out of balance sleep cycle. The study from the Biological Rhythm Research writers, however, hints at previous studies and findings that “several factors, such as social and academic demands, part-time jobs, [...] affect the sleep-wake cycle of college students.” but then only states the findings of a particular study, and does so in...
We live our entire life in two states, sleep and awake1. These two states are characterized by two distinct behaviors. For instance, the brain demonstrates a well-defined activity during non-REM sleep (nREM) that is different when we are awake. In the study of sleep by Huber et. al., the authors stated that sleep is in fact a global state2. It is unclear whether this statement means that sleep is a state of global behavioural inactivity or the state of the global nervous system. The notion that sleep is a global state of the nervous system served as basis for sleep researchers to search for a sleep switch. The discovery of the sleep switch, in return, provided evidence and enhanced the notion that sleep is a global state of the nervous system. The switch hypothesis developed from the fact that sleep can be initiated without fatigue and it is reversible1. It was hypothesized that there is something in the brain that has the ability to control the whole brain and initiate sleep. Studies have found a good candidate that demonstrated this ability3. They found a group of neurons in the Ventrolateral Preoptic (VLPO) nucleus. It was a good candidate because it was active during sleep, has neuronal output that can influence the wakefulness pathway, and lesion in the area followed reduce sleep3. The idea that there is something that can control the whole brain and result sleep state supports the idea that sleep is a global state of the nervous system.
All children need sleep and want sleep during the weekdays and that is very difficult. It has been noticed that older students and younger students, such as third graders and eleventh graders, sleep patterns are very different. In many places it is the same way that middle schools and high school start earlier than elementary schools. The problem is that adolescents stay up at least two and a half hours later than younger children do (Bergin 2). Older kids stay up for various reasons and younger children can fall asleep easier and earlier than high school students. Kids from elementary school all the way to high school tend to get up at relatively the same time but as stated before older kids go to sleep later than younger children. Ages 3-17 children tend to get up at the same time which is 7 a.m. (Bergin 1). The sleep patterns differ between high school students and elementary students but they are also very different between students and teachers.
I was able to successfully complete four sleep pattern logs, including two week days and two weekend days. After comparing my sleep logs to each other, I believe that I have an adequate amount of sleep each day. Sleep is something that is important for growth, creative thinking, restoring and rebuilding memories, recuperation and protection of humans as individuals (Meyers, 98). Getting adequate sleep has great effects on our bodies.
A restorative theory claims that sleep is used to repair the body including the brain. Oswald suggests that slow wave sleep is when body repair occurs and REM sleep is when the brain is repaired. This is supported by the fact that there is an increase in the secretion of growth hormones during SWS. This could also explain why brain activity levels are high during REM sleep, and similar to when awake.
the sleeper will gradually descend deeper into sleep, becoming more and more detached from the outside world and progressively more difficult to awaken. Stage three is the beginning of deep sleep, occurring about thirty to forty five minutes after you first fall asleep. The deepest sleep occurs in Stage four. Stage three and four has the biggest and slowest brain wave. REM sleep, a mentally active period during which dreaming occurs, provided a biological explanation for this phenomenon. Scientists found that brain activity during REM sleep begins in the pons, a structure in the brainstem, and neighboring midbrain regions. The pons sends signals to the thalamus and to the cerebral cortex, which is responsible for most thought processes. There are several myths about sleep. For one, how much sleep a person should get? According to our text book people should sleep for at least eight hours to maintain sound mental and physical health. But every one doesn’t get the chance to sleep for that amount of time. There is no normal amount of time you should sleep. Everyone is not the same. For one I might sleep for five hours and feel refreshed enough to work another shift. Other hand my cousin might need more then eight hours of sleep to feel refreshed.
When children make the transition from primary school to middle school or high school, it affects them a lot when the changing of their own sleep cycle affects the way they actually learn. Dr. Judith Owens, who is the director of the Sleep Medicine Clinic at Children's National Medical Center in Washington, D.C., says "adolescents are programmed to fall asleep later,” (2013). She wants to change school start times to later because "we are asking [teens] to be awake and alert at the time in their 24-hour clock when their alertness level is at its very lowest,” (2013). She also says that most teens can’t usually fall asleep until 11 p.m. Sleep expert Amy Wolfson of College of the Holy Cross in Worcester, Mass., says that children should try to get eight and a half to nine and a half hours of sleep a night. Waking up at six a.m. leads to bad sleep patterns creating sleep deprivation.
The four stages of sleep are REM (rapid eye movement sleep), NREM1 (non-rem), NREM2, and NREM3. During the REM stage “your heart rate rises, your breathing becomes rapid and irregular, and every half-minute or so your eyes dart around in momentary burst of activity behind closed lids” (Myers, 2014, p. 96).
We experience two phases of sleep which repeat themselves every ninety to one hundred and ten minutes, achieving approximately five complete cycles per night. The phases are non- rapi...
There are five stages of sleep. The first stage is when one prepares to drift off. During this stage, one experiences Alpha and Theta waves. This stage generally lasts five to ten minutes. The second stage lasts about twenty minutes. The brain begins to produce short periods of rhythmic brain waves known as Sleep Spindles. Body temperature begins to drop and the heart rates slows down. During stage three, slow waves
Maynard, W., & Brogmus, G. (2006). Safer shift work through more effective scheduling. Occupational health and safety, 16.