Dietician
Sleep is not only a time of rest, but also a complex process during which our body and mind go through various stages of regeneration and information processing. Understanding how individual sleep phases are, such as NREM and REM, is important for taking care of our health and well -being. In this guide, we will look at what sleep phases are, what significance for our body, and how disorders of these phases can affect our health.
What are sleep phases?
Sleep is a complex physiological process that plays an important role in the regeneration of the body and in maintaining physical and mental health. During sleep, our body and brain pass through various stages, called sleep phases, which are repeated periodically overnight. Each of these phases has a specific function and is necessary for the proper functioning of the body. Understanding what sleep phases are, what meaning and how they run is important for the conscious care of the quality of our sleep and general health. Sleep can be divided into two main phases: NREM (non -rapid eye movement) and REM (Rapid Eye Movement). The NREM phase includes four stages that differ in sleep depth and brain activity. The REM phase, characterized by fast eye movements, is the period when the brain is very active and the body goes into a state of muscle relaxation. During the night, sleep cycles, consisting of NRE and REM phases, are repeated several times, and each of them lasts from 90 to 120 minutes.What is the most important sleep phase?
All sleep phases are important because they perform various, complementary functions. However, the special importance of two phases can be pointed out: deep sleep (nrem 3) and the REM phase. The deep sleep phase, also known as a slow -wave dream, is important for physical regeneration. It is in this phase that the body repairs damaged tissues, strengthens the immune system, and also releases hormones such as growth hormone, which is necessary for cell growth and regeneration. In turn, the REM phase, in which the rapid movements of the eyeballs occur, is extremely important for mental and emotional health. It is in this phase that intensive information processing, memory consolidation and emotion analysis take place. The REM phase is also associated with dreams that can play a role in processing everyday experiences. Therefore, it can be said that both deep sleep and REM phase are necessary for full regeneration of the body, and their deficiency can lead to serious health problems, both physical and mental.Phase nrem - what is it?
The NREM phase, or non -rapid eye movement, covers four stages that differ in sleep depth and brain activity. Each of the stages has a separate function, and their sequence is significant for a healthy sleep. Here is a brief discussion of each of these stages:- Stage 1 (nrem 1) - This is the most subsequent stage of sleep, which is the transition between standby and sleep. In this phase, the body begins to calm down, the movement of the eyeballs is slowed down, and brain activity decreases. There are often so -called Small myoclonus, i.e. sudden, involuntary muscle spasms that can wake us up.
- Stage 2 (nrem 2) - This is a sleep phase, which accounts for about 50% of the total sleep time. At this stage, brain activity is still slowed down, but there may be short explosions of activity called sleep spindles. The body begins to relax, the body temperature drops, and the heart and breath become regular.
- Stage 3 (nrem 3) - This is the deepest sleep phase, also known as a slow -wave dream. In this phase, the brain produces the slowest waves of Delta, and the body performs the most important regenerative processes. It is here that tissues, muscle growth, strengthening of the immune system and growth hormone secretion occur. In this phase it is very difficult to wake up, and people who are woke up may feel confused.
- Stage 4 (NREM 4) - Although formerly considered a separate stage, this phase is currently treated as part of stage 3, because it is characterized by similar, very low brain activity and deep sleep.
REM phase - what is it?
The REM (Rapid Eye Movement) phase is a special sleep phase, which is distinguished by fast eye movements, increased brain activity and the occurrence of dreams. The REM phase is called a paradoxical sleep, because although the brain is very active in this phase - almost at the level of standby - the body goes into full muscle relaxation, called muscle atony. This prevents movement that could be dangerous if the body reacted to dreams. The REM phase is important for information processing and memory consolidation. In this phase, the brain organizes and strengthens memories, and also analyzes emotions, which can be important for dealing with stress and adaptation to new situations. The Rem phase appears at the end of the NREM cycle and lasts initially short, but its length increases with each subsequent sleep cycle, reaching the longest periods just before the morning awakening. ReM phase disorders, such as Rem Sleep Behavior Disorder (RBD), can lead to serious health problems, including an increased risk of neurodegenerative diseases such as Parkinson's disease.Sleep phase disorders - examples and effects
Sleep phase disorders can have various forms and can lead to serious health consequences. Here are some examples of the most common sleep phase disorders:- Insomnia (insomnia) - It is characterized by difficulties with falling asleep, keeping sleep or waking up too early. Insomnia can lead to sleep shortage, which results in fatigue, concentration problems, reduced immunity and an increased risk of chronic diseases.
- Obstructive sleep apnea (OSA) -This is a disorder in which repetitive episodes of breath retention during sleep due to respiratory tract narrowing occur. Sleepless apnea disturbs the normal course of sleep phases, causing frequent waking up and fragmentation of sleep, which leads to chronic fatigue and increased risk of cardiovascular diseases.
- Rem Sleep Behavior Disorder (RBD) - This is a disorder in which there is a lack of muscle atonia in the REM phase, which means that the dreamer performs movements in accordance with the content of his dreams. This can lead to injuries, both in the dreamer and his partner. RBD can also be an early symptom of neurodegenerative diseases.
- Sleep and wakefulness arrhythmias - concern irregularities in the sleep schedule, such as the delayed sleep phase syndrome (DSPS) or the accelerated sleep phase syndrome (ASPS). These disorders can lead to problems falling asleep or getting up at normal hours, which hinders daily functioning.
How to monitor sleep phases and improve their quality?
Monitoring of sleep phases can be important for understanding how well we sleep and whether our sleep is regenerating enough. Modern technologies offer a number of tools such as smartwatches, fitness bands and mobile applications that allow you to analyze movements and sounds during sleep, which can provide valuable information on the quality of our sleep. To improve the quality of sleep and take care of the proper course of its phases, it is worth using a regular sleep schedule that helps maintain a stable daily rhythm. It is also important to avoid exposure to blue light emitted by the screens of devices before bedtime, as it can disturb the production of melatonin, the hormone responsible for falling asleep. Comfortable conditions in the bedroom, such as the right temperature, silence and darkness, are also crucial for the optimal sleep. In addition, avoiding caffeine and heavy meals before bedtime can help prevent problems with falling asleep and improve the overall sleep quality.Summary
Sleep phases, including NREM and REM, play an important role in the regeneration of the body and maintaining health. Understanding how these phases run and what they mean is important for taking care of the quality of sleep. Regular, healthy sleep is the foundation of good physical and mental health, and sleep phase disorders can lead to serious health problems. That is why it is worth monitoring the quality of your sleep and, if necessary, introduce changes that will help improve its quality.Sources
Carskadon, M. A., & Dement, W. C. (2017). Normal Human Sleep: An overview. Principles and Practice of Sleep Medicine, 15-24. Walker, M. P. (2017). Why we sleep: unlocking the power of sleep and dreams. Scribner. Kryger, M. H., Roth, T., & Dement, W. C. (Eds.). (2016). Principles and Practice of Sleep Medicine. Elsevier Health Sciences. Xie, L., Kang, H., Xu, Q., et al. (2013). Sleep Drives Metabolic Clearance from the Adult Brain. Science, 342 (6156), 373-377.
Dietician
Karolina Dobrowolska-Zrałka
doktor nauk medycznych i nauki o zdrowiu, dietetyk kliniczny Absolwentka studiów I i II stopnia na kierunku dietetyka oraz doktorantka w Szkole Doktorskiej Uniwersytetu Medycznego we Wrocławiu
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