While I'm unfortunately prone to other negative emotions, I haven't noticed feeling "grumpy" very much in recent years... although I know I was a lot during childhood ;)
These last few days I've been grumpy a lot ;) I've discovered that there are two major factors in being grumpy for me:
1. Being tired. No big surprised, its also correlated with Patri, probably with most people. Also explains why I felt grumpy so often during childhood (I was on asthma medicine that made my hyper and unable to sleep in the evening and I had to get up early for school).
2. Being hot. Thankfully it only gets hot a few days/year around here. Unfortunately this means that most local homes including my own and the home pottery studio I go to do not have air conditioning ;) I've gotten very frustrated and "difficult" twice in the past few days. In addition to feeling hot, I start getting stupidly argumentative and I can feel my face and upper body flush as I get increasingly frustrated. Haven't lost my temper, but its the closest I've gotten in a really long time, and both times over very stupid things!
Hopefully both the weather and I cool off soon ;)