This is considered to be a protective measure to prevent us from getting hurt while trying to act out our dreams. REM sleep is often accompanied by muscle paralysis. Many times, we will not remember our dreams, unless we were woken up during REM sleep. Our most vivid dreams happen during REM sleep, so a person might have dreams four to five times every night. Therefore, make sure you get a good night’s sleep. Again, keep in mind that the average human undergoes several sleep cycles, comprising all the stages of sleep every night. The stages of sleep are important because our bodies are repairing muscles, stimulating growth, boosting our immune systems and energizing for the next day. You will stay in REM sleep for longer periods with each cycle. You will typically go through four or five sleep cycles at night. This is called sleep inertia and it can last anywhere from 15 minutes to several hours. REM sleep can occur at any time but it usually begins about 90 minutes after you first fall asleep. REM sleep, also known as Rapid Eye Movement, is our dreaming state. Brain waves are more active than in Stages 2 & 3 and eye movements are more rapid. Awakenings occur more easily although if you wake during the middle of a REM period, you might feel groggy. Parasomnias (sleep walking, sleep talking and night terrors) occur during this deepest stage of sleep. This is the most difficult stage of sleep to wake up from. In stage 4 sleep, as your brain produces more delta waves, and you respond to external stimuli even less. 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.
#Light vs deep sleep full#
Full cycles featuring all the five stages of sleep is essential for health and wellbeing.
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