Lie flat without pillows feel more comfortable, the reason is: first, not pillows the back of the neck muscles will not be directly compressed by the pillow, the neck muscles temporary relaxation and blood circulation is smooth, not easy to form acidic metabolites accumulation, so there will be no soreness symptoms. Second, no pillow in the sleep process, the heat generated by the neck can be distributed in time, so as to avoid overheating of the neck and neck discomfort, but if long-term non-pillow, will cause serious adverse effects on the cervical spine, cervical curvature will straighten or even cervical lordosis caused by cervical spondylosis, such as dizziness, nausea, chest tightness, panic, neck pain and upper limb discharge pain and other symptoms, so lying flat without pillow feeling More comfortable is temporary.