Why do I fall asleep when I lie down, and why do I fall asleep easily when I lie down?

Some people sleep, preferring to sleep on their side, to the left, and it is the right side that oppresses the left; To the right, the left oppresses the right. Sleeping on your back.

The front chest is pressed against the back, and the prone person is the back pressed against the chest. In any case, there is a relationship between the oppressed and the oppressed. Some people say that when he stands up and sleeps, it becomes the upper body pressing on the lower body, the weight of the whole body pressing on the soles of the feet, and the oppressed are even more miserable.

So what is the best sleeping position to choose, it depends on the individual situation. Scientific research says that it is best for people to sleep on their right side, which may be the best sleeping position for human beings, but the best is inevitably universal, such as fat people, fat people can only choose a sleeping position that is scientifically considered bad--- sleep on their backs. If the fat man sleeps on his side, the whole body weight is pressed on the arm, and he will not sleep for long, and the fat man sleeps on his back, and the huge body is scattered on the broad back, and the pressure on each part is lighter, and the fat man sleeps more deadly, so he also sleeps for a long time.

Thin people can sleep in any position, except for sleeping on the left side, because the most important organ of the whole body is on the left, and the most important organ naturally cannot be compressed, especially those who grow bigger and heavier.

To sum up, as long as gravity exists, the relationship between oppression and oppression, will always exist. When the oppression is always present, we have to choose a relatively comfortable pressure position to sleep.

Because lying down to sleep is the most comfortable, the body can be stretched and relaxed to the maximum extent, and the purpose of sleep is achieved.

If you don't have the conditions to sleep lying down, you really want to sleep, and you can fall asleep while sitting and standing, but it will be very uncomfortable after waking up.

If you don't lie down and sleep, who are you standing, it's human instinct, you are born to lie down and sleep, isn't it.

Of course, I was very comfortable lying down.

There is a pair of nerves in the human body: sympathetic and parasympathetic.

When the sympathetic nerve is excited, the abdominal viscera and peripheral blood vessels constrict, the heart rate strengthens and accelerates, hypermetabolism, pupil dilation, and the working capacity of tired muscles increases. The activity of the sympathetic nervous system mainly ensures the physiological needs of the human body in a state of tension.

When the parasympathetic nerve is excited, the pupils are narrowed, the heartbeat is slowed, the blood vessels are dilated, the small bronchial tubes are constricted, the gastrointestinal peristalsis is strengthened, the sphincter is relaxed, and the saliva secretion is increased.

The parasympathetic and nervous nerves are functionally completely opposite and antagonistic to each other.

When people stand, it is when the sympathetic nerves are excited, so it is not easy to fall asleep. After lying down, the muscles relax, the heartbeat slows down, the parasympathetic nerves are gradually excited, and the person quickly falls asleep.

Because the blood flows slowly when lying down, the brain reacts more slowly, so it is easy to fall asleep.

People are generally more relaxed when they lie down, and they are easy to fall asleep when they are relaxed.