Funny to notice that I probably have'nt yet written to this thread as I should be the one to really call this mine...
If I don't have an early wake up call and there's something interesting going on, like RPGs or WW-games, I can hang around and participate to early morning hours (I guess I once played a heated ww-game up to 6 or 7 AM!). Happily that doesn't happen too often.
But what's much more normal is that the bedtime gets streched with an hour or two. So if I have thought that I should try to get to sleep around midnight (that's my normal rhythm), a game, an RPG post or an interesting discussion pushes that to 1.30-2 AM. That's more than commonplace.
But that's also understandable. My days are normally quite packed so the only time I can hang around here is basically the evenings or late nights...
Nice to see others share this condition.