NREM Sleep Case Study

834 Words 4 Pages
Sleep plays huge role in everyone’s daily routine. It is one of the most important requirements with nutrition and exercise to have a healthy, happy life. Mastin (2013) defined that sleeping is a body and mind condition which occurs naturally and recurs periodically every day. While sleeping, mental and muscular activities are minimized. That is the reason why people are less capable to accept stimulus coming from outside. However it has to be considered apart from hibernation, coma or anesthesia states since it is simply and instantaneously reversible (“Definition”). For years it was believed that, sleep was a passive state in which humans minds were shut down. Philosophers called it rehearsal of the death. Fortunately few decades ago it was …show more content…
By taking data from these machines sleeping is separated into two main broad types which are REM (rapid eye movement) sleep and NREM or non-REM (non-rapid eye movement) sleep. Each has their own physiological, neurological and psychological features. NREM sleep divides into 4 stages too which are called stage 1, 2, 3 and 4. According to American Sleep Association (2016) it is a cycle starts from stage 1, ends with REM sleep and repeats itself consistently. Stage 2 has the longest part in the cycle, 50 percent of sleep is spent in this stage. Second longest one is REM sleep with 20 percent and others have 30 percent. Length of these stages changes according to human’s age. For example infants spend around half of their sleep in REM sleep (“What İs Sleep?”). During stage 1 people can easily be awakened. In this stage heart rate starts to slow down and breathing becomes steady, muscles are not inactive and eyes can twitch. Beta and gamma brain waves are observed. When stage 2 begins muscle activity decrease more, awareness of outside begin to stop almost totally. Brain waves in this stage are mainly theta waves. There might be a little fluctuations in the brain waves frequency called brain spindle which does not happen in stage 1. In International Review of Neurobiology it is stated that people who were awakened from stage 2 mentioned generally ordinary, usual environments instead of talking about awkward and incredible situations, disquieting feelings (McNamara et. al., 2010, p.71). During stage 3 and 4 all body functions are in their minimum level. Dreaming is rarer than REM sleep in this stage but also more frequent than other ones. The American Sleep Association (2016) reported that deep sleep includes these 2 stages. In stage 3

Related Documents