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Your Body is a Clock

Around 30 to 50 percent of people sleep between the hours of 11 pm and 7 am. Another 40 percents are either slightly morning people or slightly evening people.

To understand why some people are early birds while others are night owls, we have to take into consideration the body's circadian system.

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@gabrielagg

created an idea from a article:

VOX

If you're just not a morning person, science says you may never be

vox.com

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Social Jet Lag

When our personal clock is out of sync with the one of our society, our health suffers.

Less Sleep is dangerous

It has been associated with higher blood pressure, body mass index, and increased calcification of the coronary artery.

Tick Tock

Every single cell of the body has clock genes, bits of DNA that flip on and off throughout the day.
Like the body as a whole, the cell's metabolism is scheduled for efficiency. Clock genes regulate the expression of between 5 and 20 percent of all the other genes in the cell.

Sleep Habits

Being a morning (or evening) person is inborn, genetic, and very hard to change.

Early Bird or Night Owls

The body is an orchestra of organs, each providing an essential function. In this metaphor, the circadian rhythm is the conductor. The conductor makes every neurotransmitter, every hormone, and every chemical in the body cycle with the daily rhythm.