^Woman I used to work with would drink red bulls non stop .. and.. fall asleep at her desk.
I swore off tea, coffee and soda as a youngster. Fell off the wagon on fizzy drinks recently but.. I don't worry about it too much.
If I drink coffee I can't sleep for 36 hours or so.
That happens to me. I don't know if it's a prediabetic insulin response to the sugar in the sodas, but yeah, I had to stop drinking sodas entirely because they used to put me to sleep.
I'm the same way with sleep. I was never a big coffee drinker, but drank tea with heavy cream for years. Unless I drink it first thing after I wake up, it definitely ruins my sleep.
It was Orthodoxy that got me to examine whether I should limit my coffee drinking, and eventually, once I realized that I should not drink it daily because I was dependent upon it, and rather I should be more dependent upon God, then I gradually realized that drinking it daily was negatively affecting my health.
I think coffee and other stimulants do not give energy, they simply release energy that is stored within the body, but those energy stores or reservoirs are necessary for other physiological functions and overall good health, so when they are reduced or depleted by regular caffeine use, there are negative health effects.
Now I think caffeine should not be used daily, but only sparingly and when needed.
I have a similar theory that caffeine doesn't give you more energy or make you less tired, it just makes you
feel less tired by hiding your tiredness from your brain. Thus, you still function like you're about to fall asleep, i.e. prone to making mistakes, you just make them
more productively and energetically than if you weren't drinking caffeine. Obviously this is more of a problem in some professions (surgeon, electrician, etc.) than others.
I quit drinking tea for Lent this year, and it was a great decision. I finally got a cup after Lent, and that was when I realized how fake the caffeine high was. I didn't enjoy it at all, and just felt weird after going without it for two months. Since then I haven't drank caffeine hardly at all. I do miss the flavor and having a warm drink in the morning that keeps me feeling full like the tea and heavy cream used to, though, but I've gotten more or less used to it by now.