Many people respond that they have pain after waking up from sleep but not during the day, which is a common rest pain. Rest pain is a common phenomenon such as lumbar spine osteoarthritis or lumbar muscle strain, when you wake up from sleep and feel a lot of pain in your back, and then feel no pain after you move around. What is the main reason, for example, at night when sleeping, blood circulation slows down, the body inside the pain-inducing inflammatory substances metabolism is very slow, the concentration is relatively high, wake up to the pain will be very obvious. When the activity is opened, the blood circulation is accelerated and the inflammatory substances are dispersed. There is also a saying that in the morning, the level of hormones in the body is low, that is, adrenal hormones, which have an analgesic effect, and during the day when the level of hormones is high, plus the day is noisy, the tolerance of pain will be better, the feeling of pain is not as sensitive as at night or when waking up, mainly for this reason.