Ah but you shouldn't drink caffeine past 6pm

You really don't need to tell people not to do the things that they enjoy doing. Most people aren't idiots: they know what works for them.

When I met my wife she would consistently drink a pot of coffee around 8PM and fall asleep an hour later. Different people are wired differently.

Not to disparage your intention here. But couldn't you apply the same argument to this paper's results?

I.e. "Some people don't need to walk 22 minutes a day, don't tell them to do so. Different people are wired differently."

Just as there is evidence walking 22 minutes a day improves lifespan for the /majority/ of people, drinking caffeine 6 hours before bed is considered negative for your sleep for the /majority/ of people. It's sound advice, even if it's telling someone what to do.

While I believe suggesting people be more lenient to other's life choices is good - it's a practice in empathy - sometimes people are misguided because the might not realize the impact of their actions, haven't thought about their actions thoroughly, etc. These mentions can be wakeup calls just as often as they can be negative/annoyances. I'd argue OP keep suggesting advice and instead we all try to keep open minds is the safer choice, for the /majority/ at least.

You can always get decaf or hot chocolate or something else if caffeine bothers you. But of course people have to pick on the use of coffee instead of the advice to have a goal.