Why Does Coffee Make Me Sleepy? Some Facts About Coffee Consumption

Are you one of those people who often end up thinking, why does coffee make me sleepy? Or why do coffee acts as a seductive drug for me and not end up refreshing my brain?

It is not a thing to worry about a lot, but there can be numerous reasons for coffee, making you feel dizzy or tired.

Coffee is a diuretic. Drinking it to stay awake can quickly lead to a vicious dehydrating cycle that makes you more tired.

Coffee contains a stimulant drug called caffeine that is highly recognized worldwide. This drug wakes a person up by making his brain work faster and by boosting up his energy levels.

But for some people, its result comes out to be the opposite. Instead of feeling more energetic and fresh, they feel weariness and fatigue in their bodies after drinking coffee. 

Intake of Caffeine Affects Multiple Parts in Your Body

Caffeine is considered a powerful stimulant because of its ability to interact with several parts present in your body. These parts mainly include the brain and the heart. It also affects the flow of blood in the body by making the heart pump faster. 

The blood flow usually speeds up on caffeine consumption, but it can also end up utilizing a lot of energy. It is because of the hindrance produced in its flow due to the reduction of water. 

Read more: Buy the best decaf coffee beans

Caffeine Stimulates the Process of Diuresis

According to a study, caffeine makes the blood thicker by reducing the percentage of water in it. Caffeine is a diuretic substance that makes a person urinate more often by promoting diuresis in the body. 

It is one of the primary reasons for a person feeling fatigued after drinking coffee. The reduction of water in the body causes dehydration leading to thicker blood. It ends up transferring less oxygen throughout the body. After which one immediately feels sleepy and tired. 

For some people, caffeine acts as a sedative drug. Fewer oxygen levels decrease the speed and ratio of the average body working. This decrease gradually causes a person to feel sleepy. 

How Long Does It Take for Caffeine to Kick in? 

Caffeine does not take much longer to reach its max in the body. But its effect varies from person to person. Usually, it takes around 45 minutes to start showing its results.

It may take a few hours to feel the high-up in the body in the coffee case. It is because the caffeine used in the coffee you drank may not be that strong. 

Addiction to Caffeine Can Also Cause Fatigue

If your intake of coffee is on a regular daily basis, then your body must have been adapted to it accordingly. Now, if you will skip it for a day or two, then the reduction of usual caffeine presence in your body can make you feel dizzy, weary, or sleepy. 

You may not feel high on drinking coffee regularly, but skipping it anytime will surely make you want it as it contains caffeine. 

Intake of Low-Level Coffee Can Lead to Unwanted Results

Can coffee make you sleepy even if you are a regular coffee drinker? Well, Yes! It can happen if you opted for a cheap coffee brand. Some brands or local markets supply cheap quality stuff that is a mixture of low-quality caffeine with other substances.

Drinking such coffee can make you feel sleepy and tired because of the irregular reactions taking place in the body. 

Do Your Homework Before Buying Coffee

When looking for cheap coffee, one must consider its quality as it contains a potent stimulant drug. Any issue with the quality of caffeine present in the coffee can lead to serious health problems.

Have you listened to consistent coffee drinkers saying coffee puts me to sleep now? It happens mostly because of the change in the quality of coffee, which leads to unpleasant outcomes. That is why they feel exhausted instead of revitalized as they did before. 

Caffeine Hinders the Working of Adenosine

Adenosine is an effect known to make a person feel tired. Drinking coffee makes it difficult for the brain to connect to such receptors of weariness and decreases this effect.

This happens because caffeine has the capability to hinder and then clear the adenosine out of the brain. That is why it is well known for boosting up the energy levels in the body. 

Amount of Caffeine Affects Adenosine

So, eventually, it stops your brain from feeling fatigued, but in case you do, then there might be some abnormality in the functioning of the caffeine present in your coffee. 

Sometimes, if you start drinking coffee too much, it may become a part of your body and stop hindering your brain’s normal functioning, which can be one of the reasons you do not feel the refreshment anymore by drinking coffee.

Adenosine Can Also Be a Cause of Dizziness

When caffeine enters the body, it affects the brain’s functioning to make it feel refreshed and energetic. For that, it does not allow the adenosine substance to bind up with brain cells that result in not feeling tired at all. 

But when the effect of coffee starts to fade away, many adenosine substances that were present before or were produced during the presence of caffeine in the body activates.

They start looking for cells to bind up with. When no hindrance is found in the way, they bind up with various brain cells and suddenly making you feel tired and sleepy. 

But that usually happens when the effect of caffeine completely vanishes from the body that is often after about 4 to 5 hours. 

Regular and Excessive Consumption Can Also Lead to Weariness

When a person starts the consumption of any drug or alcohol, then at the start, he may notice a lot of changes and feel high at times. But when this consumption becomes a routine, it may not have such strong effects on your brain or body. The same thing goes with the intake of caffeine too. 

People consuming it in excessive amounts on a daily basis may not feel its effect as firmly as those who do not drink coffee often. In this case, coffee may not help you feel refreshed or revived as it did before. Eventually, it may end up in having no particular effect on your brain or body at all. 

It May Not Be the Coffee, Making You Feel Sleepy

The usual intake time of coffee for many people is during office time or when they have a lot of work to do. Consumption of caffeine may make them feel fresh and full of energy for a small period, but at last, its effects cannot stay forever.

They may feel tired or fatigued because of the work they have lined up. Or also because of the uncertain time at which they drink coffee. Sometimes, when the caffeine’s effect completely wears out from the body, there can be a sudden slowdown in the heart rate and blood speed.

Body Transition from One State to Another

This is simply a transition state of the body, transferring itself to its normal working. 

This state can drop your blood or oxygen levels making you feel down immediately. It can generally happen when your muscles are not able to get enough oxygen required to do work. So, coffee may not be the cause every time you do not feel better. 

Consumption of More Energy by The Body

When caffeine enters your body, it makes your heart and brain cells stimulate faster than usual. Their more rapid and increased activity consumes more energy breaking down the glucose molecules present in your body. 

Sudden usage of energy and consumption of glucose can lower the sugar levels in the body that may lead to weariness and tiredness. Utilization of energy and glucose molecules may also make you feel hungry afterward. 

Adenosine is a byproduct of your brain activities, and when it accumulates at high levels, it makes you feel tired.

As this all would happen after you consume coffee, you may have a permanent impression of coffee, making you feel low, hungry, and tired.

But, if this proceeding is considered altogether, it is actually not the coffee or caffeine doing so; it is your body that does not has enough capability to cope up with the changing circumstances in the body. 

Coffee Containing a Lot of Sugar Can Also Be a Reason for You Not Feeling Its Effects

Sweet coffee that contains more than usual amount of sugar ends up giving a sugar rush to your body instead of making you feel high because of caffeine. Caffeine dissolves into the body at a very high rate.

But when it comes to the sugar, it mixes up with the blood and body much more quickly than the caffeine. 

So, when caffeine and sugar enter at the same time, sugar shows its effects much faster than caffeine. This can also be a reason for you not being able to experience the pure results of drinking coffee or consuming caffeine.

The Coffee Does Not Have the Same Effects On Everyone

If your friend feels exhilarated after having a cup of coffee, it may not be the same for you. Not everyone reacts similarly to drugs, including caffeine. Some may have a robust immune system and defensive mechanism in the body, so it may not be easy for any drug to affect the normal functioning of the body. 

Sometimes, due to some reactions taking place in the body, coffee makes me tired. You may also feel down or tired after drinking coffee. But at the same time, some of your friends can have a fantastic time drinking that some kind of coffee.

Factors that Play a Role

This can also depend upon your body situations, such as when did you eat last? Are you a regular drug consumer or just take it occasionally? No doubt in the fact that the reaction of your body at first-ever intake of caffeine would be utterly different from how it reacts now. 

Maybe, you would have felt a lot better or vice versa, but now, it just feels good as it causes the secretions of dopamine in the body.

Amount of Your Water Intake Matters

When it comes to coffee consumption, the amount of water present in your body plays a significant role. Coffee usually leads to dehydration that can also end up making you feel dizzy.

If your water intake is less than the required amount, then maybe your caffeine consumption would affect you a bit differently. 

The Dopamine Effect

People who usually drink a lot of water have more dopamine secretions in the brain than those who do not. It is because the presence of water in their bodies normalizes the body’s functioning. Then, any external drug or medicine can perform at its best in the body without hindrance. 

So, if you are very low on your water levels in the body and coffee makes you tired, then you certainly know the reason by now. Maybe give a shot to increase your average water intake. That would surely help you in getting better results out of caffeine and other substances. 

Coffee Makes Me Tired, Does It Happen to You Too?

Caffeine makes me tired now. But as I am a coffee lover, I badly want to feel the pleasure hidden inside it. If you are on the same side of this situation as me, then there are sundry ways to enhance your experience with coffee.

Giving a shot to some of these may be beneficial for you:

  • If the intake of a lot of caffeine is not giving you the desired results, you should try drinking just one or two cups a day. Maybe, your body is not being able to adapt with much higher amounts of caffeine. Drinking less coffee will help your body to cope up with the caffeine in a better way. 
  • Try to increase the water level of your body to allow it to work efficiently and in a reasonable way even when caffeine enters in it. 
  • Caffeine can affect the blood flow in the body and to the brain. You may feel dizzy if you are a patient of blood levels or any cardiovascular diseases. In this case, you should avoid caffeine consumption or any other drug as it will make it difficult for your body to normalize itself with the drugs flowing in the blood. 

Higher Levels of Caffeine Do Not Help Every Time

People who feel tired or sleepy after drinking coffee usually start drinking a lot of coffee to get better results. This won’t help you in getting better results. Instead, it will end up causing you nausea or will lower your hunger levels.

Caffeine VS Hunger and Anxiety

Caffeine is popularly used for suppressing the hunger levels in the body. Consuming too much of it will make the situation worse for your body. Caffeine sensitivity varies everywhere. Some people may face anxiety and restlessness issues after increasing the consumption of their coffee.

If you are a regular drug consumer, then caffeine may not affect you as it is supposed to. Drinking higher levels of it will not help, too, in this case. They will just end up making you feel more exhausted and frustrated. 

Therefore, if coffee makes you feel sleepy or tired, even if you have perfect physical and mental health, it will not increase the amount of caffeine consumption. Maybe, it’s just your body that cannot adapt itself to the caffeine’s working proceedings. 

The Other Side of Caffeine

This can also be seen from another perspective. Caffeine basically releases dopamine from the brain, which is the primary reason why many people love and enjoy drinking coffee. But, some people do not like it because their brain does not secrete enough dopamine chemicals on the intake of caffeine. 

The same concept can also fit in the fact that everyone reacts differently to different substances, including caffeine. So, the next time you are thinking about the reasons why does coffee makes me sleepy, think about it by keeping your body’s health type and working in view. 


So if you have been feeling a bit different, sleepy or weird the past few days or weeks after your coffee consumption, don’t fret about it. Even I do have those moments when I am thinking why does coffee make me sleepy?

Just have a look at all the aforementioned factors we told you and try to assess which one factor or more than one could be applying in your case. All of the causes mentioned above can be fixed within a short time period.

All you have to do is make sure you are not overdoing something – usually it is easy to ignore or miss out completely on a certain irregularity or abnormal behavior that is completely involuntary and unintentional.

Take care of your coffee consumption habits and keep enjoying this amazing beverage!