If back pain occurs occasionally after sleeping, the reasons are as follows: 1, it may be due to inadequate warming measures during sleep at night, resulting in a long period of cold in the lower back and pain caused by spasmodic contraction of local muscle tissue. 2, it may be due to improper sleeping position or uneven mattress during sleep at night, resulting in continuous stretching of the muscles of the lower back, affecting local blood circulation, resulting in ischemic pain symptoms. 3, if there is a long period of strenuous exercise in the lower back before sleep, it may also be due to lactic acid accumulation stimulating the surrounding muscle nerves. The pain may also be caused by the accumulation of lactic acid stimulating the surrounding muscle nerves if there is a long period of strenuous movement of the low back before sleep. If you get up from sleep and have low back pain, it is possible that the pain is due to lumbar back fasciitis caused by continuous strain on the muscles of the low back. This is mainly due to the relatively slow local blood circulation during sleep at night and the slowed metabolism of inflammatory substances, which accumulate in the tissue interstices and cause pain.