Sleep is an important activity, accounting for about 30% of a person's day, helping to recover physically and mentally after hard work. You may not know, even when you are fast asleep, the body still does not sleep completely, but continues to perform life activities. So do you know how to recognize someone who is fast asleep? What are the main stages in a sleep and what do they mean? Let's find out that useful information in Ru9's article right below.
1. Learn the stages of a sleep
To understand how to recognize someone who is fast asleep, you need to understand the stages of a normal sleep and what they mean. Accordingly, sleep usually consists of 5 main stages: lull, light sleep, deep sleep, very deep sleep and finally dreaming (also known as REM). These stages always happen in sequence and repeat throughout your sleep time.
Sleep is divided into different stages.
In addition, the 5 stages of sleep are also divided into 2 main parts: NREM/Non-REM (non rapid eye movement) sleep including lull, light sleep, deep sleep, very deep sleep, and REM sleep. (rapid eye movement) includes the sleeping part.
The lulling stage
The lulling phase usually lasts only 3 to 15 minutes, starting with the moment you close your eyes and fall asleep. At this stage, you are usually only light sleepers and can be awakened easily. Many people wake up at this stage, and some may experience a sudden seizure (also known as a Hypnic Myoclonia), which is similar to a startle response to being tapped on the shoulder.
Light sleep stage
Normally, this stage will last about 50% of the night's sleep, when the eyes will stop moving and brain activity will also slow down. In addition, in the brain at this time there is also a rapid heat wave and thinning in the next stage.
Deep sleep stage
Studies show that deep sleep only lasts about 10% of sleep time. At this time, the brain waves are slow and sparse, but sometimes there are also some fast waves. During this stage of deep sleep, whether breathing rate, heart rate or body temperature will decrease, skeletal muscles relax.
Deep sleep stage
As one of the most important parts, the very deep sleep stage makes up about 20% of the whole sleep, also the time when the body is completely rested. Therefore, factors such as heart rate, breathing rate as well as temperature will be reduced to the lowest level, the eyes do not move and the muscles of the limbs are also completely relaxed.
If you accidentally wake up during this stage, you will feel extremely dizzy, disoriented and return to normal within a few minutes. When you observe these expressions, it also means that you know how to recognize a person who is fast asleep.
Observing the expression when sleeping is a way to identify a person who is fast asleep.
Dreaming stage
The dream phase is completely separated from the others and is known as REM, or Rapid eye movement, and accounts for about 20% of total sleep time. Except for the inactive limb muscles, breathing rate, heart rate, temperature or frequency of eyeball inversion during this period all increase gradually. This is also the stage where dreams occur and you may still remember one of them when you wake up.
2. How to recognize someone who is fast asleep?
Have you ever wondered how to tell if someone is fast asleep? Let's start by observing their activities that can be considered confusing, because at this time, the part that controls activities as well as awareness is entering the resting phase.
Talking while sleeping
One of the ways to tell if someone is fast asleep is to hear them talk while sleeping. According to a recent accurate report, about 5% of adults have this condition, and usually occurs about 1-2 hours after starting to fall asleep.
Talking nonsense is a sign that a person is fast asleep.
Specifically, the part that controls pronunciation is still active, leading to involuntary movements of the mouth muscles and talking. This is a common phenomenon and has been shown to do no harm to the body.
Shake hands and feet
When the body enters a state of deep sleep, it is easy to move your arms and legs wildly. Experts have explained that it is caused by limb movement disorder, which is usually only about 4% of people, and especially in women.
If you have this syndrome, you may act very confused while sleeping and wake up with no memory, with cycles of 20 to 40 seconds. Usually, this syndrome is caused by harmful food consumption, heart disease, bone disease or overwork. You can know how to identify someone who is fast asleep through the information that Ru9 provides.
Falling in a dream
Many people have admitted that they fell in a dream and felt so dizzy that they were startled to wake up. This syndrome is also known as “convulsions” and can appear in people of all ages. It can be said that falling in a dream causes heart rate, breathing rate and even temperature to increase rapidly, even sweat and shock.
Swinging arms and legs is also a way to recognize a person who is fast asleep.
Currently, there is still no definitive answer to explain the cause of this phenomenon. However, most people often think that long-term insomnia and stress can cause the body and brain to be inconsistent, cause imbalance and indirectly create "falls" in dreams. . However, this is also a common way to identify people who are fast asleep.
See more: How to get a good night's sleep even when there's noise around
In short, Ru9 has shown you 3 easy and common ways to identify people who are fast asleep, which are through their characteristic actions during sleep. During deep sleep, some organs of the body will perform necessary activities. That's why so many experts have advised us to sleep deeply to protect our own health in the long run.
