Cerebral thrombosis may occur during sleep, and the common symptoms are numbness, weakness, loss of sensation in one limb, and slurred speech, etc. Its numbness is mostly persistent, and less often manifests as hand numbness only, and most of them are numbness in one upper and lower limb or single limb, therefore, if it only manifests as hand numbness during sleep and relieves quickly, the probability of cerebral thrombosis is relatively low.