[quote name='GuyWithGun']Back to the original question, here's some information on drug tolerance:
The human body likes to stay at a state of equilibrium, and will do what it can to maintain homeostasis. (A good example might be regulating body temperature in both hot and cold climates)
Whenever a new drug that the body has never dealt with before is introduced, the drug has it's most profound effect. You may have heard it called the exhiliration of the first high or something like that. This is because the body has never encountered it before and does not know how to react appropriately. However, the more and more you use the drug, the more experience with the biological effects your body has, and thus it can account for the effects when introduced to the body.
This is also known as building a tolerance. All that means is that your body is finding a way to return to homeostasis whenever this drug and its effects are introduced. So if caffeine is introduced and makes your body alert, your body will try to couneract the drug by releasing chemicals that make you tired. This is also a reason why when caffeine wears off you crash. Because your body has released so many chemicals to counteract the caffeine and make you tired which are still in your body after the caffeine has lost effect.
Your body also reacts to signals in the environment in order to counteract the effect. So if every morning you get up, go to the coffee pot and make coffee and do your coffee routine, eventually your body will recognize this cycle as one that will soon follow with the introduction of caffeine. Therefore, it will prepare and start releasing the chemicals before the coffee even hits your lips. (This is actually one cause for ODing, but I won't get into that)
So that's the medium-sized possible answer to why you are tired after drinking a cup of coffee. Your body is used to the average two cups and releases the counteracting chemicals accordingly when you start drinking that first cup, even if you don't drink as much at that sitting.
---If I missed anything or forgot something let me know. I could go on a while longer, but figured most didn't make it to the end of this post anyway. You'll all be tested on this material tomorrow morning.[/QUOTE]
hey thats pretty good doc. lol i never see my parents with a downer after drinking coffee.

\ Can you recommend any other thing I could take in the morning or am I doomed to falling asleep anyways due to that teacher's boring classes :O I want to see what alcahol has an effect on me, since I never drink ... back to the experiment..thanks again doc.