8:30 is the moment at the convention when I make the fateful decision -- stay in my room with maybe some reading / writing / tv and go to bed at something close to my normal 9:30-ish, or go down to the bar and socialize for the next several hours. Option a will let me feel good tomorrow. Option b is fine, as long as I sleep in, but could potentially wreck me for the next day.
Sometimes I think it must be nice to be a night person, an owl instead of a lark. (Only at conventions, really.)