Waking up at 4 o’clock in the middle of the night is not a case of cancer. Most of them are due to sleep dysfunction, which may be caused by insomnia for a long time, mostly related to mental stress, overuse of brain and long-term staying up late. If you have snoring and obstructive sleep apnea syndrome for a long time, or even have psychological disorders, you may wake up early in the morning, and after waking up early, you may have sweating, flushing, panic, shortness of breath, etc. You should go to the general internal medicine clinic for a detailed examination to determine whether there is any organic disease.