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Alzheimer's disease is a progressive neurodegenerative disorder that primarily affects memory and cognitive function. It is the most common cause of dementia among older adults. The disease was first identified by Dr. Alois Alzheimer in 1906, and since then, research has advanced significantly, offering insights into its characteristics and progression.

Sleep is a vital part of our lives. It's a time for our bodies to rest, rejuvenate, and prepare for the next day. But how much sleep do we really need? There's a common belief that we need eight hours of sleep each night. However, some people claim they can function perfectly well on just four hours. Is this really possible? In this article, we'll delve into the science of sleep. We'll explore the myths and facts surrounding the concept of getting only four hours of sleep. We'll look at the potential effects on your health, both physical and mental. We'll also discuss strategies for coping with limited sleep when necessary. Whether you're a health and wellness coach, a science journalist, or a biohacker, this comprehensive guide will provide you with the information you need. Let's debunk some myths and uncover the truth about four hours of sleep.