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![ss7cwdocm7.png](https://img.esteem.ws/ss7cwdocm7.png)

Hello friends,

Have you ever waken up with very tired feeling even if you slept less or much last night? You all day long irritated, tired. And maybe you didn't work well that day.


Or you stayed up late last night but need to get up early to work on next day. 

***So how do we stay up late but get up early and still not feel tired, irritated.***

![lacqkihem3.gif](https://img.esteem.ws/lacqkihem3.gif)
[source](https://wifflegif.com/gifs/657426-snow-white-and-the-seven-dwarfs-gif)

So this post will help you answer the questions of the two issues mentioned above. And it shows you the reason why sleep less is still awake while you sleep more , but still tired. 


Perhaps you will feel unbelievable. But that's because you haven't had any experience with it yet. And that is why you should read this post carefully. 

![ss7cwdocm7.png](https://img.esteem.ws/ss7cwdocm7.png)

## <center>The science of sleep</center>

### How to sleep?

I used to like many people who did not have the science of sleep science. They would simply think that sleep is a sleep disorder.

For example, we go to bed at 22:00 and wake up at 6am, we will sleep a circuit during that time.

That is wrong, you guys, because human nature we don't sleep so.

We sleep in cycles. Each cycle is 90 minutes

<center>![n8iwg7iz6e.jpg](https://img.esteem.ws/n8iwg7iz6e.jpg)</center>
<center>[source](https://www.google.com.vn/url?sa=i&source=images&cd=&cad=rja&uact=8&ved=2ahUKEwjHs_ScjJncAhUSE6YKHWV1BZ8Qjhx6BAgBEAM&url=https%3A%2F%2Fpngtree.com%2Ffreepng%2Fsleeping-beauty-cartoon_1785432.html&psig=AOvVaw16B97A0zzXVoqO7uTTdp4I&ust=1531468857436861)</center>

Each cycle is divided into 5 small stages. 

<center>![01cfh9e61p.jpg](https://img.esteem.ws/01cfh9e61p.jpg)</center>

<center>[source](https://www.macalester.edu/projects/UBNRP/Website_REM_Sleep/healthSleepCycle.html)</center>

When we complete the five stages of a 90 minute cycle, we will move on to the next 90 minutes.

And every night we sleep 5 cycles, which is 7.5 hours and a half, then we get up very well.

### So back to the main question is why we wake up we feel tired?

And this is the answer.

***If we wake up in stages 3 or 4 then you will definitely have a very tired day, irritated***

Stage 4 is when our body is in complete rest. So, when awakened, all the organs must react immediately. 

At this time the organs are not prepared to return to normal.

So whether you sleep from 10 pm to the morning, 8 hours or more, you are still tired as usual.

From there we get a conclusion. 

### How can you sleep well?

* **Get enough sleep**.  That means we have to sleep five full cycles

* **Wake up at the right time**. That is, we have to wake up to the intersection between the end of stage 5 and the beginning of stage 1.

Now the organs in our body are ready to start up again. 

If you wake up at this time of the day, you will feel great, not tired at all.

![ss7cwdocm7.png](https://img.esteem.ws/ss7cwdocm7.png)

## <center>How to sleep less without being tired</center>

For example, last night you go to bed at 1am, and you have to wake up before 6 am. So how do that with feeling tired. 

Fortunately, we have a sleep calculator for getting waking time.

This formula will help you accurately calculate the exact time, the interference point of the end of phase 5 and the beginning of phase 1.

<center>![5b7rjom78l.jpg](https://img.esteem.ws/5b7rjom78l.jpg)
[source](https://itunes.apple.com/us/app/sleep-timer-smart-alarm-bedtime-calculator-for-better/id1057027109?mt=8)</center>

14 minutes is the time you have estimated from lying down to entering the first stage.

For example, I now calculate the waking time as follows: The time to sleep is 22pm, the time will be 5.44pm.

Another example is that we sleep at 1am but in the morning we have to wake up before 6am to finish work. How do we do it?

A perfect night cycle is 5 but can range from 3 to 6.

So let's suppose we sleep three cycles, according to the following formula we will be waking up is 5.44 am.

***I hope this post will help you in part to be able to adjust your sleep in the most suitable way.***

![ss7cwdocm7.png](https://img.esteem.ws/ss7cwdocm7.png)


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