When you sleep, the organs of the body take a rest, while the body regenerates. This is why you should adopt a healthy sleep pattern and reduce staying up late, because lack of sleep makes the body work extra hard, so you will be tired the next day.
Sometimes, you will even dream while you sleep. However, it turns out that there are several stages that you must go through before you are really asleep. After closing your eyes, you definitely need a few minutes to really sleep well. What are the stages of sleep? Come on, see the review to complete, yes!
Phase 1 NREM
The NREM (Non-Rapid Eye Movement) stage is also known as chicken sleep. This term is familiar to your ears. Chicken sleep is a term that describes the state of sleep, but your mind, mentality, and body are in the middle between sleeping and half-conscious. In this phase, the brain releases beta waves, fast and small waves.
In Phase 1 of NREM, you can still wake up or wake up easily even if you are asleep. In addition, muscle activity and eye movement when you enter this sleep phase will be slow.
When the brain’s performance starts to slow down, this important organ also releases alpha waves. This is marked by the appearance of strange sensations that you feel, like real but you are closing your eyes. You will experience a sensation such as falling to the jolt, or feel someone is calling your name. This sensation is called hypnagogic hallucinations. The surprising jolt you feel is called myoclonic jolt.
Phase 2 NREM
Entering stage 2 NREM in sleep, breathing, and heart rate becomes more regular, followed by a decrease in body temperature. At this stage, your awareness decreases. Even though you hear voices, you don’t really understand what’s happening.
Eye movements stop and brain wave propagation occurs in this phase. The body prepares to sleep soundly with the presence of sleep spindles. In collaboration with K-complex, these two activities protect sleep while suppressing the response of stimuli from the outside.
Phase 3 NREM
After going through the second stage, at this stage you fall asleep more soundly. The brain releases delta waves that make you less responsive. At this stage there is no indication of muscle movements or eye movements. This phase becomes the transition phase between comfortable sleep and deep sleep.
You will be hard to wake up at this stage. After successfully waking up, you still have to adjust to the surrounding conditions, or ‘collect lives’ is not impossible, there are unconscious activities, such as bedwetting, delirious, to sleepwalking. At this stage the body performs tissue repair or regeneration while increasing the blood supply to the muscles, also strengthening the body’s immunity.
Now, you are entering the final stage or REM (Rapid Eye Movement) aka dreaming sleep. In contrast to stages 2 and 3, at this stage, there is an increase in activity due to the emergence of dreams, such as breathing and heart rate that is getting faster, eye movements that tend to be aggressive, restless, to blood pressure that has increased.
Dreams occur because of increased activity in the brain, but the muscles actually experience temporary paralysis. Data from The American Sleep Foundation states that a person spends approximately 20 percent of his sleep time at this stage or for 70 to 90 minutes.