Having a fever, runny nose, coughing, getting nosebleeds every time I sneeze sick.
I mention this as a reminder that what you see of someone online isn’t really them. It might be a close approximation of them (I do my best to keep them congruent), but it’s not the same.
And maybe I look like I’m online because I have chat clients that stay online, so it just looks like I’m “away” instead of “head pounding like a drum” or “asleep”.
So remember that of the people you’re interacting with online. You only get a facade, not the whole story.