Things happen during sleep

During sleep, the body regains energy, to prepare for the new day with better physical and mental activities. The following are interesting and surprising things about sleep.

1. Move the eyes back and forth

Normal sleep in the night consists of 4 to 5 cycles. Accordingly, each period of 90-120 minutes consists of 5 stages: the stage of sleep, sleep, deep sleep, very deep sleep and paradoxical sleep.

At this stage, it is also known as the sleep of the Moven (Mouvement Oculaire Rapide), because of the movement of the back and forth of the eyeball but not in the memory when you wake up. This stage is usually about 90 minutes after sleep and takes about 20% of the time.

Normal sleep in the night consists of 4 to 5 cycles.

2. Production of growth hormone

One of the reasons for good sleep is that the body secretes growth hormone needed to regenerate tissue, bone, muscle and is also essential for the development of children.

3. Kidney reduces sleep activity

During the day, the kidneys increase filtration to eliminate toxins through the urinary tract, but at night it decreases, and urine output also decreases compared to the daytime. This shows that at night there is less urination and every morning wake up urine is usually dark.

4. Grind your teeth

Maybe due to stress during the day or teeth are not aligned. Technically, this is a tooth grinding disease and sometimes there is a feeling of jaw bone pain or dental complications. Should visit the dentist because in the long term may cause tooth damage.

5. Sudden movements

There are times when sleeping suddenly startled or have a strong feeling of shaking, this often happens and is not serious. This is due to muscle spasms.

6. The brain removes what is not needed

Thanks to the lymphatic system, during the day brain accumulates information and at night analyzes and removes what is not needed. This system helps clean up the central nervous system.

Finally, you know that during sleep, the body also consumes energy, and this is why sleeplessness tends to be overweight and obese.