Why do older people need less sleep?

Sleep is a fundamental biological process necessary for the proper functioning of the body. In older people, there is a tendency to have less sleep compared to younger age groups. Why do older people need less sleep? What is the reason for this? What can help to lengthen sleep?
Sleep is a fundamental biological process necessary for the proper functioning of the body. In older people, there is a tendency to have less sleep compared to younger age groups. Why do older people need less sleep? What is the reason for this? What can help to lengthen sleep?
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