There is no exact answer to the question of how many hours of sleep is normal for a 70 year old, and the exact amount of sleep should vary from person to person. There is no clear standard for how many hours a 70 year old sleeps, some older people may sleep 7~8 hours a day, while some older people may sleep 6 hours a day, some even shorter, the specific time is determined by the physical condition as well as their own habits. The 70 year olds who have short sleep time at night and are often in light sleep may be caused by some adverse factors, such as psychological factors, environmental factors, disease factors, etc. Poor quality of sleep for a long period of time will have an adverse effect on physical health. Therefore, elderly people with sleep disorders should seek medical attention for detailed examination, clarify the causative factors and carry out reasonable treatment under the guidance of doctors.