Sleep is a part of people's daily activity cycle. People's sleep is divided into several stages, and these stages are also cyclical.
If you are an ordinary sleeper, your sleep cycle is as follows. When you are sleepy for the first time, your eyes will roll, your body temperature will drop slightly, your muscles will relax, and your breathing will become slow and regular. Your brain waves are also a little slow. In the first few minutes, the alpha rhythm of fairly fast brain waves is dominant. This is called stage 1 sleep. In the next half hour or so, as you relax more and more, you will enter the second and third stages of sleep. The lower your sleep stage, the slower your brain waves. Then, about 40 to 60 minutes after you lose consciousness, you will go into the deepest sleep. Your wavy bra will show big slow waves, which is called delta rhythm. This is the fourth stage of sleep.
If you are a normal sleeper, your sleep cycle will be like this. When you start to sleep, your eyes will roll a few times, your body temperature will drop slightly, your muscles will relax, and your breathing will become slow and rhythmic. In addition to the alpha rhythm in the first few minutes, the brain waves also slowed down slightly. This is called the first stage of sleep. In the next half hour or so, you relax further and enter the second and third stages of sleep. The deeper the sleep, the slower the brain waves. About 40 to 60 minutes after you start sleeping, you will fall into a deep sleep state. At this time, the brain waves show huge slow waves, which are called delta rhythm. This is the fourth stage of sleep.
You won't be in the fourth stage of depth all night, but your brain activity level will increase slightly again about 80 minutes after you fall asleep. The δ rhythm will disappear and be replaced by the activity pattern of brain waves. Your eyes will start to move quickly under the closed eyelids, as if you were watching what was happening in front of you. This period of rapid eye movement lasts about 8 to 15 minutes, which is called rapid eye movement sleep. During REM sleep, your body will soon relax again, your breathing will become slow and regular again, and you will slowly slide back from 1 stage to stage 4 sleep-close to consciousness again after about 80 minutes.
But you haven't been in this state of sleep all night. About 80 minutes after falling asleep, the level of brain movement will increase slightly again. The δ rhythm disappears and is replaced by the movement pattern of brain waves. Your eyes will move quickly under the closed eyelids, as if you were watching what was happening in front of you. This rapid eye movement period lasts about 8- 15 minutes, and this stage of sleep is called rapid eye movement (REM) sleep. During REM sleep, your limbs will soon relax again, your breathing will slow down again and become rhythmic, and you will easily slide from the first stage of sleep to the fourth stage-until you are close to waking up again after about 80 minutes. Exercise is good for our health. All work and no play makes Jack a dull boy. Through exercise, we can relax. At the same time, it can harden muscles and have a good figure. If we don't exercise for a long time, we will easily get sick.
I like several outdoor sports. Swimming in the sea is my favorite. Because there are too many people in the swimming pool and the water is always dirty, I prefer swimming in the sea.
Playing badminton is also very interesting. I can always find a place to play badminton in the park. Besides, I like jogging in the morning. Sometimes, my parents and I jog in the park.
Exercise is good for our health. All work and no play makes Jack a dull boy. Through exercise, we can relax. At the same time, you can exercise your muscles and have a good image. If we don't exercise for a long time, we will easily get sick. I like outdoor sports very much. Swimming in the sea is my favorite. Because there are too many people in the swimming pool and the water is always dirty, I like swimming in the sea. Playing badminton is also very interesting. I always play badminton in the park. Besides, I like running in the morning. Sometimes, my parents and I jog in the park. I can only write so much. I hope it helps you.