I actually didn't realize that the "remain invisible" setting was default (that or I changed it a long time ago when I first created my account). So before you all mentioned it, I just assumed that the little green triangle was present on my posts, since it was there when I viewed my posts.
I did turn my online-status back on when I realized it was off. However, I did not do so in the intention of affecting this game. Rather, I did not want to forget about it later, because I feel that it would be more fair in future games for the online status to be present. While I did consider the possibility that it might look like it might look like "cheating" to get Sleepyhead's alibi to look correct, I thought that, since I would not be posting in the thread anymore, that it wouldn't matter. In hindsight, I probably should have waited until the game ended.
Again, I apologize if my actions might have negatively impacted the game. It was not my intention. In fact, since all the yellow wolves had been run up on the first two days, I thought that there was no way that Sleepyhead would NOT be lynched.