Does green tea keep you awake?

In this brief guide, we are going to answer the question “does green tea keep you awake” with an in-depth analysis of whether or not green tea keeps you awake. Moreover, we are going to discuss the effect of caffeine on the body and the way to properly store green tea.

So without much ado, let’s dive in and figure out more about it.

Does green tea keep you awake?

So green tea contains 30 grams of caffeine per cup. It is approximately 3 times less than that of the caffeine content of coffee but still, it is caffeine and it will do what it is best at. 

So what caffeine does is that as soon as you drink a cup of green tea and the caffeine finds its way to your bloodstream, it reaches the brain and binds to the adenosine receptors. Now when caffeine has bound with the adenosine receptors, the adenosine won’t find the receptors to attach to, thus it won’t be able to carry out its function.

Now the question arises “What is the function of adenosine?” and “How blocking adenosine activity is related to alertness and attention?” Adenosine is the neurotransmitter that regulates the sleep cycle and also has an impact on the level of alertness and attention. So what adenosine does is that as soon as it gets attached to its receptor, it sends the signal to the brain that now it’s time to sleep. It induces sleepiness by sending signals to your brain.

Now in the scenario, where caffeine has blocked all the adenosine receptors, so when adenosine won’t be able to bind with its receptor, it won’t be able to carry out its function, thereby you will stay awake.

But here is a catch to this whole phenomena, there is another compound “theanine” present in the formulation of the green tea. Now what this compound does is that it works as the antagonist of the effect of caffeine, which means that it counteracts the action of the caffeine.

Now the question arises “does theanine cancel the effect of the caffeine?” The answer to this is “No”. Especially the people who are caffeine sensitive won’t be able to sleep after drinking green tea. So it is recommended to drink green tea at least 2 hours before going to bed because if you consume the green tea at bedtime, it will hinder your ability to fall asleep. 

Moreover what you can try is to opt for a low-caffeinated green tea or you can steep the green tea at room temperature so that your brewed green tea will have low caffeine content (the higher the temperature of the water is more will be the amount of tea extracted and the more will be its caffeine content). 

You can read about the benefits of green tea here.

What are the effects of caffeine on the body?

Caffeine increases the cortisol and adrenaline secretion in the body that results in increased heart rate, breathing rate, and mental alertness. It also helps you to focus and stay awake by stimulating your nervous system. Moreover, the coffee also contains dopamine that is a brain stimulator, and helps you to stay focused and alert.

The caffeine once consumed, starts working very quickly as it can easily pass the epithelial layer lining the mouth, throat, and stomach to reach the blood. So it takes about 30-60 minutes for the caffeine to reach its peak level and provide you with a surge of energy. 

Caffeine has a half-life of about 5 hours in an average adult body according to the stats provided by the American Academy of Sleep Medicine. This means that half of the caffeine, as well as half of its effect, is gone within the first 5 hours.

As the excessive intake of tea or coffee can increase your overall caffeine intake that can cause some health problems like bloating, gas, etc., therefore, it is recommended to limit your daily caffeine intake to 300 mg.

How to properly store the green tea?

The proper way to store green tea is to keep it in an air-tight container, jar, or air-tight bag in a cool, dry, and dark place. It should be noted that the place should not be humid or else the humidity of the environment can decrease the shelf life of the green tea.

When green tea is exposed to moisture there are great chances of mold formation on it and it will go bad afterward. Moreover, it should also be stored away from direct sunlight. So a cool, dark corner of your pantry will be a good place to store your green tea.

You should always seal the pouch after scooping out the green tea. Moreover, you should never use a wet spoon to scoop out the tea from the package or the container in which it is stored.


In this brief guide, we answered the question “does green tea keep you awake” with an in-depth analysis of whether or not the green tea keeps you awake. Moreover, we discussed the effect of caffeine on the body and the way to properly store the green tea.



Mahnoor Asghar is a Clinical Nutritionist with a bachelor's degree in Nutrition and Dietetics. She is compassionate and dedicated to playing her part in the well-being of the masses. She wants to play a fruitful role in creating nutrition and health-related awareness among the general public. Additionally, she has a keen eye for detail and loves to create content related to food, nutrition, health, and wellness.

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