I do this. A lot. And no one would know. And function totally fine. Heh. I don't say anything though, because it would probably lead to the suspicion that I was "on" something. But no. I've had that thrown at me out loud simply over my night owl ways(!) Argh! No. It's just how I am!
I normally can't nap either. Can only do it if sick or depressed. Napping disorients me and doesn't refresh at all, so there's little point to it.
Ummmm…. lots! Things noticed over the years….A lot of people, when they're doing well, to not be on much, then come by when it's not so much so. (Though for some people, they find themselves triggered, and it works the opposite way for them.) There's also the antsy all-over-the-forums zip -- of answering everything in sight or starting a lot of threads in rapid succession (personally, I can't sit at one thing like that unless just mildly up.) But regarding the time we spend on the forums, I'd say the biggest indicators are in the writing style. Wall of words... No paragraph breaks…Disorganized. Sometimes it is so obvious. You can feel it in reading. I've definitely seen a lot of times when others will pick up on a shift before the poster recognizes it themselves. Especially when we get to know people over time. But yeah, if we get to know our "forum ways", it could be used to good advantage right alongside other indicators we watch for (see also: "one in every color?! Sold!" ).