If you sleep 4 hours a day, you can increase the possibility of sudden death. Adults are recommended to sleep 6 to 8 hours a day, and children should sleep for a relatively longer period of time. Maintaining sufficient sleep helps the body functions to recover and maintain normal metabolism. However, sometimes due to overwork, sleep for 4 hours may not allow the body’s nerve function to fully recover. If the vegetative nervous system is not adjusted to recover, it may increase the risk of diseases, such as cardiovascular disease, neuropsychiatric diseases, and may also sudden accidents. Promote a healthy lifestyle and ensure 6 to 8 hours of sleep every day to help the body functions recover. If there is any discomfort, it is recommended to go to the hospital in time for treatment.