Coffee: Does it Really “Wake You Up”?

Do people want to know how does coffee wake us up?

Really, coffee may bring you back to your normal state of alertness when sleepy.

You have a chemical in the brain, adenosine, that makes you sleepy, it is a byproduct of normal cell activity. This chemical builds up and increases in the system, normally, it is not lost or able to detox it out of the body.

Adenosine is used up only when you are sleeping, so it increases when awake, the flow of caffeine inhibits the adenosine compound and ends up stimulating us more.

When caffeine comes into the cells, then we get that lift of energy and positive moods. Then the pleasure molecule, dopamine, comes in and connects to caffeine molecule, increasing surges in several body systems:

  • Increases your heart rate
  • Increases blood pressure
  • Increases urination and diarrhea
  • Increases oxygen flow to the brain and muscles
  • Can contribute to anxiety and insomnia

 This stimulant from caffeine begins 15 minutes after ingestion and can last up to 6 hours, according to the Michigan University Health Service.

After you start drinking more and more caffeine, the adenosine keeps building and you get headaches, become more tired or depressed. Until you stop the caffeine or get your sleep will the adenosine levels go back to normal. 

The Level of Caffeine “Wake Up” depends on: 

  1. Size of your cup, an 8-ounce, 12 ounce, or 16 ounces.
  2. Type of roasted coffee, light, medium, or dark roast.
  3. The brew method used, drip, pressed, or pour-over.
  4. How fast you drink your coffee.

 Plus, when you add the extra sugar and cream to your coffee, this will even increase your stimulation and Keep You Up!

If you buy your coffee in a special drink at those coffee shops it can increase your sugar by double and triple the amount of sugar stimulation.

Dr. Ian Campbell, the head of National Obesity Forum, says these drinks are a “sugar bomb”, and if consumed late in the day, collateral damage to your sleep cycle. 

Coffee Wakes You Up Conclusion

Enjoy your coffee earlier in the day and with normal to moderate amounts so as to not affect your sleep. So, take that Wake-Up call, just limit your intake late in the day.




Cindy Burrows, B.S., M.T., Herbalist and is a Nutrition and Wellness Consultant helping individuals with health programs to improve life and happiness. She is a writer, speaker and owner of several businesses.



Written by Cynthia Burrows