People must sleep for 8 hours a day? The survey of the American Cancer Society shows that people who sleep an average of 7 to 8 hours a night have the longest life expectancy; 80% of people who sleep an average of less than 4 hours a night have a short life expectancy. The best sleep time is different for different age groups, and you should sleep scientifically according to your age. Is it insomnia to sleep less than 8 hours? Normal people sleep at 7.5 hours on average, with 4 to 5 hours for short sleepers and 10 to 11 hours for long sleepers. The quality of sleep is not in the quantity, there are some short sleepers but more energetic, more likely to achieve results. Are sleeping pills poisonous? Almost all drugs have toxic side effects, and sedative drugs are no exception. Drowsiness, lack of concentration, and memory loss are common side effects, but the benefits outweigh the disadvantages compared to the benefits. The key is to choose the right medication, dose, and dosing cycle.