After researching for hours, I have found people who get so tired taking NAC they almost cant function.

I swear, if there is a 1% chance of a side effect, I GET IT.

There was much discussion as to why but it was all theory, nobody really knew for sure why it happens to some people.

I took another pill 2 hours ago, and well, I just woke up, after forcing myself to get up. Again, it made me very sleepy.