Introduction: Sleep is an essential factor for overall health and wellbeing. Every human being spends approximately one-third of their life sleeping. However, have you ever thought about how sleep works and what happens during the different phases of sleep? In this article, we will discuss in-depth the different stages of sleep and how they work. We will cover the mechanisms of each stage, what happens to the body during sleep, and some of the possible benefits of each stage. Sleep Stages: There are two main types of sleep: rapid-eye-movement (REM) sleep and non-rapid-eye-movement (NREM) sleep. NREM sleep is divided into three stages: N1, N2, and N3. Stage N1: Stage N1 is the first stage of the sleep cycle, where we experience the transition from wakefulness to sleep. During this stage, we tend to have light and dreamless sleep. Eye movements slow down, and muscle activity reduces, which makes it easier to fall asleep. At this stage, the brain produces theta waves, which are slower th...
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