Sudden death is the sudden and unexpected death of a seemingly healthy or chronically ill patient with a stable condition, mainly due to the presence of organic diseases and abnormalities in the cardiovascular structure. Under the condition of underlying pathology, sudden death may occur when there are triggering factors that cause discomfort. For example, overexertion and mental factors increase adrenaline secretion and vasoconstriction in the body, which can lead to hypertensive stroke, and coronary heart disease patients can also cause sudden death due to a sudden increase in cardiac load. Sudden death can be triggered by many factors, including violent mood swings, after excessive alcohol consumption, after strenuous physical activity, after heavy smoking and forceful defecation, etc. Of course, sudden death also occurs in a quiet state, such as rest, sleep or conversation. People who have black and white reversal and have enough sleep usually do not have overexertion, and as long as the time is properly arranged and they are not emotionally overwhelmed at night, it usually does not cause serious adverse effects on the body. People with underlying diseases are not recommended to live in black and white reversal, improper regulation is likely to cause physical exertion, fatigue, poor mental state, etc., and become a risk group for sudden death.