Stage 4: Deep, non-rapid eye movement sleep. It is difficult to wake someone up from Stage 3 sleep. Your brain starts to produce delta, or slow waves, and you won’t experience eye movement or muscle activity. It’s less common to wake up during this sleep stage though it’s still relatively light sleep. Sleep researchers believe both sleep spindles and K complexes protect the brain from awakening from sleep. There are specific bursts of rapid activity known as sleep spindles mixed with sleep structures known as K complexes. Your brain waves also continue to slow down. Your body temperature begins to decrease and your heart rate begins to slow. Stage 2: This is the first pronounced NREM sleep stage in which you are no longer awake. You may also experience so-called hypnic jerks, a sudden jerk of the entire body or one body segment such as an arm or leg, or muscle spasms. This sleep stage is easily disrupted by short awakenings. As our body relaxes, brain wave activity begins to slow down compared to when awake. This is the lightest stage of NREM sleep and is the transition from the waking state to sleep. There are 5 stages of sleep in each sleep cycle: Non-REM (NREM) Sleep (Stages 1, 2, 3 & 4) and REM Sleep. For this reason, it makes sense to improve one’s sleep quality as much as possible within the framework of one’s everyday life and avoid sleep deprivation. During sleep, our short-term and long-term memories are consolidated, our bodies regenerate, and our immune system is working at its hardest. Full cycles featuring all the five stages of sleep is essential for health and wellbeing.
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