That would make sense, but for me this irritability arises out of nowhere, when I was previously feeling great. It strikes at the most inconvenient times, over the most minor things or nothing at all (that's not to say that annoying circumstances don't trigger irritability as well, but it doesn't have to be from any particular cause while I'm hypomanic.) It's like my mind is moving at a faster rate than my body. Also, when I work on these huge projects while hypomanic I do not feel stressed at all. Quite the opposite actually..like I have a crazy abundance of energy that just can't be stopped! I had to be reminded several times by my boyfriend to even eat or drink. I didn't feel slight fatigue until I had been working for at least 11 hours