Exploring 5 Stages of Sleep


So, what exactly happens when you hit the sack? According to the National Sleep Foundation, a night of healthy sleep should cycle through five sleep stages every 90 minutes or so. The first four stages make up our non-rapid eye movement (NREM) sleep, and the fifth stage is when rapid eye movement (REM) sleep occurs.


Different phases of adequate sleep


Stage 1: Drowsy
This is the transitional phase. You may be partially awake while your mind floats in and out of consciousness. After 5-10 minutes, this drowsiness will eventually lead you to the next stage.

Stage 2: Light Sleep
The second stage is when the body temperature drops and the heart rate begins to slow. As the brain activity becomes slow, sleep spindles happen. This is the familiar muscle twitching you experience during sleeping. This stage lasts for about 20 minutes and this is where your “power nap” should end.

Stage 3: Moderate Sleep
Consequently, your blood pressure and breathing rate will drop while your muscles relax when you reach this stage. You are difficult to be woken up in this stage and you should be. Stages 3 and 4 are where growth hormones were released. These hormones help to replenish muscles and tissues that were exerted over the course of the day. Walking, talking, or kicking while asleep happens on this stage.

Stage 4: Intense Deep Sleep
For about 30 minutes, you will have the deepest sleep. This is the restorative phase where brain tissue grows and restored. During this rejuvenation, blood flow to the muscles increases as it gives oxygen and nutrients. Appetite-controlling hormones are also released to help you limit feeling hungry the following day.

Stage 5: REM/Dream Sleep
When you reached the REM sleep, the brain becomes more active while the body is relaxed and immobilized. The eyes move rapidly and dart in various directions. Breathing becomes slower and irregular while the heart rate and blood pressure rise from the levels they were in previous stages. Most dreaming takes place on this stage. This is the ideal stage where the quality of sleep revitalizes the brain, supporting sharp and alert daytime function.

It is important to note that these phases last for different durations at various ages.



What’s in it for you?

Understanding the sleep cycle and how it affects our body is important in order to maintain a healthy mind and body. With this information, one should always aim for uninterrupted, good quality sleep each night.

Sleep is as important as the air we breathe and the food we take. When we don’t get enough sleep, we suffer in many ways, and in various aspects of life.

 



References:
https://www.sleep.org
https://www.tuck.com
https://www.webmd.com



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