Nightmares are related to mental factors. The reasons for nightmares are mainly related to mental factors, such as being too excited and excited before going to bed, or having too much psychological pressure in a certain period, or having severe mental trauma in the past, which are easy to have nightmares.
Nightmares are related to sleeping position. When sleeping, your arms are pressed against your chest, or the quilt covers your mouth and nose, which makes people feel uncomfortable. But at this time, the mind is not very clear, and the stimulation is hidden, and the brain nerve cells responsible for directing arm activities are at rest, so nightmares may occur.
I often have nightmares and may have some diseases. If you have nightmares frequently, it may represent a sleep disorder. Generally appear in two kinds of people. One is people with cardiovascular disease and heart disease. This kind of person has poor blood flow because of insufficient blood supply in the body. Symptoms of numbness in limbs during sleep; The other kind of people are physically and mentally overworked. This kind of people are prone to limb weakness due to physical fatigue, and then suddenly feel unable to move when sleeping.