Why do people depend on coffee to wake up?

Answer 1

That is a question with many variables, such as how strong the coffee is, how much you drink of it, how long you have already been awake/when you last slept, how much energy you have already used that day, your height and weight and a few other variables... There is no standard time that coffee/caffeine keeps you awake.

Answer 2

The substance in coffee that promotes alertness is the xanthine stimulant caffeine. Chemically similar to the stimulant theobromine, which is found in chocolate, as is caffeine, and the diuretic theophylline, it has diuretic side effects--and what is more, it is a potentially addictive drug; under trade names like Vivarin(R) and NoDoz(R), it can be found in nearly-undiluted form on pharmacy shelves.

Answer 3

I'm pretty sure that it's the caffeine in coffee that keeps you awake, it's the same in tea i think. So if you fancy a coffee or tea before bed, have a decaffinated one!

I've also heard that chamomile tea helps you sleep so why don't you have a chamomile tea instead!

Answer 4

Caffeine works by changing the chemistry of the brain. It blocks the action of a natural brain chemical that is associated with sleep. The binding of adenosine causes drowsiness by slowing down nerve cell activity. In the brain, adenosine binding also causes blood vessels to dilate(presumably to let more oxygen in during sleep.)

Answer 5

People depend on coffee to wake them up as they have trained certain hormones in their bodies to respond to it.

Is in not that coffee (caffine) is really a stimulant persay, but it effects the

Answer 6

Because of the caffeine perhaps. Caffeine is a stimulant. So is sugar and chocolate.

Answer 7

Generally it has the opposite effect due to the caffeine content

Answer 8

It has lots of caffeine in it :)