Since sleep is a major event in life, we will take it for granted that the human head's evolution to today, should have been used in sleep with good support and cushioning ability of bedding, in other words, humans have long invented what Things come to the head to sleep. Yes, mankind did find something to pad the head to sleep, that is pillow. So how do you use pillows?
(1) height: whether sleeping or sleeping, it is best to choose the neck to maintain the normal physiological curvature of the pillow, adult supine or side pillow 15 cm is appropriate pillow. As the saying goes, sit back and relax, it is not true, the pillow is too excessive before the cervical spine, the neck soft tissue over tension, fatigue, prone to stiff, over time will cause the neck of the bones appear morphological changes, such as physiological bending straight, Some people like no pillow sleep or pillow is too low, this is not good, will make the head congestion, likely to cause eyelids and facial swelling.
(2) temperature: people fall asleep after the head temperature is generally 34-34.5 degrees Celsius, slightly lower than the body temperature, if the head temperature is too high is not easy to sleep. So different latitudes, different seasons, people choose the cool pillow, warm pillow is also very different, most people in the summer tend to add a mat on the pillow. So the choice of pillow to meet the regional and seasonal characteristics, so that the head to maintain the best sleep temperature.
(3) hardness: pillow only soft and without losing a certain hardness, in order to reduce the pressure between the scalp, but also to maintain uneven pressure, so that the blood circulation from the smaller pressure through the place. In addition, the person's head is also associated with the initial use of pillow, newborn pillow to moderate hardness, and pay attention from time to time to adjust the head angle, so as not to grow up after the head shape is not good.