For long I have observed such a weird thing: everytime when I had a coffee, in about ten minutes or plus, I feel sleepy. I wonder why coffee makes me sleep, on the opposite to the effect on all the others.
Recently, I have figured it out: it's my body telling me to take a coffee and at that moment, I don't feel the need though. Soon after the coffee, before the coffee taking effect, I feel sleepy. Coffee doesn't make me sleep, which makes sense.
吸毒使人兴奋,而且会过度兴奋让人进入睡眠状态
由于你原本很兴奋,咖啡让你过度兴奋了
not all the others, just some others.
除了说你的大脑跟神经异于正常人，没有别的解释
多数人认为这是异常现象，事实是有相当一部分人喝了咖啡后还是会犯困。咖啡因无法与这些人体内的某物质结合而产生兴奋。总之你并不孤单。
有时候我喝了咖啡后也会犯困，因为实在是太困了。
when u want coffee, actually ur body's tired.
So ur body just effects the very natural reaction, no matter u have coffee or not
the more desire u want coffee, the more tired ur body is
语法错误：which引导的定语丛句在这里只能就近修饰sleep
语法错误：which引导的定语从句在这里只能就近修饰sleep
Coffee always makes me thirsty, but not sleepy.
i think maybe u r already overload before you have coffee, too much coffee also makes people sleepy though.
coffee never makes me sleepy.
如果在非常疲劳的情况下喝是会催人入睡的
coffee always makes me sleepy
good sleep though
may have something to do with ADHD
but i never had any adhd symptoms
I guess, that's because you've drinking too much coffee, and you already got used to certain amount.
Caffein no longer works for you.
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Coffee makes me sleepy, relaxed.. I was told that I probably have ADHD and never got diagnosed. Since I like the flavor of coffee, the side effects, one way or the other, weren't an issue.
Until I got diagnosed with Narcolepsy. Ritalin is a cousin to Coffee.. caffeine, and chemically the brain reads them the same way. Soooo... instead of waking me up... Ritalin puts me to sleep. Argh! I had to switch to Provigil to stay awake.
Caffeine makes me sleep. 500mg intravenously in an ER confirmed this fact to doctors and nurses alike as I fell immediately into a deep sleep which they had to wake me from to ask their important doctor-ish questions of me.
So I had undiagnosed, untreated ADHD and simply learned to cope with the symptoms. I still am not diagnosed as having ADHD.. but does it really matter? No.
Coffee/lots of caffeine has made me fall asleep. It's weird, but if it has something to do with ADHD, that might explain things. Personally, I prefer drinking tea.
Such a wonderful response here:
http://www.giveupcoffee.com/2009/01/14/why-does-caffeine-make-me-sleepy/
Why does caffeine make me sleepy?
By Robert Barnes on January 14, 2009
Caffeine stimulates the adrenal glands to release adrenalin, the ‘flight or fight’ hormone that prepares the body to react to a threat. It increases your heart and breathing rates, dilates the pupils and increases blood flow to the muscles. Ideally this adrenalin release happens very occasionally during times of great physical stress. However, when we consume excessive amounts of caffeine we promote a sustained adrenalin response, which exhausts the adrenal glands. As a result, these glands are unable to produce even the small amounts of adrenalin required to help us maintain focus and concentration, which in turn creates feelings of physical fatigue and malaise.
A secondary effect of caffeine consumption that contributes to sleepiness is that it can dampen the sensitivity of insulin. This hormone is involved in detecting sugar in the bloodstream and ensuring its uptake for energy production. If insulin is not working properly, we have less sugar available for energy and will feel tired.
Finally, caffeine consumption – especially at night – can reduce the amount we get of slow-wave sleep, which we need to be properly rested and rejuvenated. A consistent lack of this deep sleep will definitely contribute to feelings of fatigue. Combine these three physical effects of caffeine on the body and you have a recipe for fatigue.