Whoever said that coffee isn't harmful for health... Tell this to the 2 flies who've just drowned in my cup of coffee.

I have a biorhythm thing. Every day at around 5pm I get so drowsy I fall asleep in my chair while working. If I happen to be driving at that time then my drowsiness becomes a potentially lethal condition.

It lasts for ~30minutes to an hour. Every day, no matter what. Coffee won't help at all - if anything, it makes it a lot worse.

It's been like that for well over 10 years. Anyone else has smth similar? How do you fight it? Powernaps help, but if I'm in a meeting I can't have them.