How long can you live if you sleep 4 hours a day, there is no scientific data to reach a clear conclusion. Normal adult sleep time is 6-8 hours, 4 hours of sleep a day is a serious lack of sleep, the specific can live how long varies from person to person. Sleep is one of the more important physiological processes in the metabolic activities of the body. Severe sleep deprivation may cause disruption of the body’s biological clock, low immunity, reduced resistance to bacteria and viruses, resulting in endocrine disorders, metabolic disorders, cardiovascular and cerebrovascular diseases will increase the chances of. Patients with chronic sleep deprivation will experience neurological and psychiatric symptoms such as forgetfulness, irritability, anxiety, etc. Serious cases may induce cardiac arrhythmia, etc., and may even lead to a state of general stress and a corresponding increase in the chance of sudden death. For people who stay up late often, it increases the risk of diabetes, psychological and neurological diseases. These risks are doubled if there is not enough sleep and there are bad habits such as eating too fatty or lack of physical exercise.