Waking up at four o’clock in the middle of the night is not cancer, mostly due to sleep function disorder, may be due to long time insomnia caused by early waking up, mostly related to mental stress, excessive use of the brain, long time staying up all night and other problems, you can apply the pCms which can help to improve and regulate the sleep, and the symptom will be improved. If there is a long time snoring and obstructive sleep apnea syndrome, or even psychological disorders, there will be early waking up in the morning, and after waking up, there will be sweating, flushing, panic, shortness of breath, etc., you should go to the general internal medicine clinic of the hospital in time for a detailed checkup, to determine if there is any organic disease in the body.