I find that they only trigger me if i'm already "on edge". I'm a pretty avid coffee drinker. I usually only drink them on work days but I can drink from 1 can of Double Shot energy drink (Starbucks) on the low to that with the addition of 2-3 cups of coffee and 1 cup of tea on the high.

Generally, I feel them physically (they make my face hot) and my pulse increase, but i'm pretty stable. When I'm "on edge" (i haven't yet determined how to tell when I'm leading into hypomania or depression), my pulse (though usually slightly lower than on my stable days but still high) becomes more noticeable, I get shaky, I have to move around and it feels more like anxiety or a need to "run away from life" and just "be free". It can get pretty bad.

On those kinds of days I have to limit myself to 0-1 drinks for the day.

I was so on edge one day that I googled caffeine and hypomania and it did suggest that it could cause like a "self induced" hypomania for some people. Again, I don't think I could self induce it, but I do have to be more aware of my vulnerability point before indulging anymore.