Why do you not feel sleepy after drinking coffee?

Answer 1

More than likely you have a built immunity to it, when consistently drinking coffee over a period of time you grow immune to the caffeine in it. Same as anything else, you take Tylenol over a period of a few years then you will notice that it doesn't have the same effect as it used to. Let it be known this works for almost anything, Birth Control would work the same way since you ingest it over a long time to stop the hormones, the hormones will adapt and will no longer have the effect it once had, and we know the result of that. The human body is an amazing thing when it comes to adaptation of almost anything.

It could also be learning from Social Psychology studies, that extroverts might feel more prone to sleepiness or tiredness after caffeine (stimulant) as extroverts have already a low cortical level in their system. Meaning they often have to go out looking for stimulation due to their low level.

However since coffee is a stimulant, it satisfies/increases this low level coritcal arousel and hence extroverts will feel tired (satisfied) upon drinking the coffee (stimulant).

Introverts on the other hand may feel more excited or stimulated, as at base level compared with extroverts, they already have a higher level or cortical in their system, hence they do not need to seek stimulation.

Therefore the increase intake of stimulant (caffeine) adds to their already high level of cortical arousel which increases activity or makes them more active.

As people diagnosed with ADD (Attentional Deficit Disorder) are given medication with high levels of stimulant to decrease their need for stimulas sensation seeking, which would calm them down.

Answer 2

The reason you feel energetic and hyper and stuff after drinking coffee, (Doesn't matter how much) is because of all the cafine particles inside the drink. Not to mention the sugar and creamer you put into it. If you drink black coffee, well same thing. Just not with the sugar and creamer. I hope I have answered your question. :D ;D

Answer 3

Coffee contains caffeine, which is a stimulant. Caffeine causes the adrenal glands to secrete more adrenalin, which causes the body to prepare for an emergency response, which of course, would require you to remain awake.

Answer 4

Usually you feel bad after drinking too much coffee. When you come off your caffiene high (crash) you can often have a headache, feel light headed, or even nautious.

Answer 5

It is because of a chemical called Caffeine which acts as a stimulant.

Answer 6

Some people may be affected that way by the caffeine or other alkaloids in the coffee.