How to use cylindrical cervical pillow is correct

There are two types of cervical pillow: one is a relatively hard cylinder, which can be padded under the cervical vertebra to restore the physiological curvature of the cervical vertebra. There is also a pillow that is similar in size to a pillow but has a head and neck shape.
The first kind of cervical pillow is suitable for lying on the back after work in the daytime, and it can be used when taking a short rest to recover the physiological curvature of the cervical spine, especially for people who work with their heads down for a long time. It can also relax the ligaments and muscles around the neck, improve the blood circulation of the neck, reduce the pressure on the cervical spine, and relieve the symptoms of discomfort in the neck, but it is not suitable for long-term use.
The second type of cervical pillow can be used when sleeping at night, but the shape of this pillow is very important. It needs to be matched with the shape of the head and neck, and the material should not be too soft. It should have a supporting effect on the cervical spine, and the overall thickness of the pillow should not be too large to prevent aggravating cervical spondylosis.