Not the moon per se, but the week before my "friend" starts (or would start, as I'm "changing" as they say), I always notice (afterwards) how affected my judgement would be, how much my ability to filter out bad decisions would change. And for me, my cycle would always be affected by the lunar cycle. In my 20s, that would be the week I would give in to bad moods and simply call off just because I felt I could not go into work. I couldn't put it into words. I simply gave in to this...overwhelming exhaustion, when every other time I could deal with it just fine. But I felt powerless to stop this. I think they make meds for this severe pms today, but back then, women just were told it was normal to not quite be yourself the week before. Maybe it is normal, but it really affected my job.