This is the final stage and in this stage finally, you get your dreams. in this stage your voluntary muscles become immobilized. REM sleep begins approximately 90 minutes after falling asleep. At this time:-<ul><li>Your brain lights with activity</li><li>Your body is relaxed and immobilized</li><li>Your breathing is faster and irregular</li><li>Your eyes move rapidly (because of dreams)</li><li>You dream</li></ul>However, it is thought that REM sleep is when emotions and emotional memories are processed and stored.

Stage 4: REM 

Using an <a href="https://www.verywellhealth.com/what-is-an-eeg-test-and-what-is-it-used-for-3014879">electroencephalogram (EEG)</a>, scientists are able to see different changes in the brain start happening as the person falls asleep. During the first stage, you're partially awake but in the third stage, you're in the deepest sleep.

Entering sleep

In general, there are two types of sleep REM ( REM means dream ) and NREM. REM is the one in which you'll b able to see the dreams and there is only 1 stage related to it. NREM means Non-REM in which you'll not be able to see dreams and there are 3 stages related to this type of sleep. They all make our sleep peaceful and relaxing.

Overview

This is the deepest sleep of your sleep time (lemme give you an idea in this sleep even an alarm is not able to break your sleep and wake you up). During 3rd NREM:-<ul><li>Your muscles are totally relaxed.</li><li>Your blood pressure drops and breathing slows</li><li>You progress into your deepest sleep</li></ul>In this also you don't have any dreams but in the next one, you have them. In this sleep, the most famous phenomenon " sleep paralysis " happens.

Stage 3: 3rd NREM 

The first stage of the sleep cycle is the transition period from wakefulness and sleep. This stage lasts for 5-10 minutes. In this, you're partially awake. During stage 1 you're brain:-<ul><li>Slows down</li><li>Your heartbeat, eye movement, and breathing slows with it</li><li>Your body relaxes and your muscles may twitch (while stretching)</li></ul>In this, you don't have any dreams.

Stage 1: The 1st NREM

According to some studies almost all the people spend 50% of their sleep time in this Stage 2 NREM. It lasts about 20 minutes. During stage 2 sleep:-<ul><li> You become less aware of your surroundings</li><li>Your body temperature drops</li><li>Your eye movement stops</li><li>Your breathing and heart rate become more regular</li></ul>Brain starts producing sleep spindles it is nothing but rhythmic brain activity. This is the stage where your brain is preparing itself to be ready for the stage 3 where all the repairs, restores, and many things happen.

Stage 2: The 2nd NREM

If you don't sacrifice for what you want, what you want will be a sacrifice.

In these ideas, I've written almost everything about the sleep that we have in our relaxed nights. 

The brain displays a variety of activity patterns at different stages of sleep. What's going on in your brain while you're sleeping?

PUSHKAR

The 4 Stages of Sleep

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Stages of Sleep - Sleep Foundation

How Sleep Works: Understanding the Science of Sleep | Sleep Foundation

What Is REM Sleep? Definition and Benefits