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Caffeine's half life is around 5 hours[1], I'd say it's fine if you drink it in the morning.

I'm quite sensitive to caffeine and I struggle to sleep if I drink coffee any time after noon. It's a pity because I love the taste of coffee and Oolong tea :(

[1] https://www.ncbi.nlm.nih.gov/books/NBK223808/

There's variability in caffeine's half life from person to person, so everyone should experiment. I only drink it in the first 3 hours of my day, but even then, if I drink too much it negatively impacts sleep onset.

can't you just drink decaf?

I do! but decaf tastes different :p

Edit: also not all cafes have decaf or they have limited options where I live.

I recommend the house decaf from Devicion or Linea. I’ve tried every high end decaf on the market and those are the winners so far

I love coffee, but it doesn't wake me up, either at the morning or at the end of the day.

I suppose it affects each person differently.

Depends on a lot of factors. detoxing completely takes days/weeks.