First of all, there is really prime time to sleep. I think it's between 10 and 6 am, which is the prime time for sleeping. It is the easiest time to fall asleep at night around 10, so we should ensure eight hours of sleep, because the sleep cycle is 90- 100 minutes, and there are 4-5 cycles in one night, so the total sleep time is eight.

The sleep time of the elderly can be relatively shortened, and 5-6 hours of sleep should be guaranteed every day. Infants should sleep more than 10h every day, and adults should sleep no less than 6h every day. But the quality of sleep is more important than the time of sleep. The specific length of sleep varies from person to person, as long as you can ensure your energy.

For patients who have difficulty falling asleep, it is recommended to exercise properly before going to bed to relax. Before going to bed, they can drink milk or soak their feet in hot water or play soft music. If necessary, they can take drugs to help them sleep under the guidance of a doctor.